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Biomedical subjects

G A Martinez

Publications and source records attributed to G A Martinez.

At least 19 recordsLinked to original sources
PubMed1995

Comparison of high-pass resolution perimetry and standard automated perimetry in glaucoma.

PURPOSE: We sought to ascertain whether high-pass resolution perimetry would provide results comparable to those of standard perimetry. METHODS: Thirty-four eyes with primary open-angle glaucoma, 37 eyes suspected of having glaucoma, and 36 normal control eyes were matched for age and lens density. We controlled for refraction, pupil size, and learning effects. Standard and ring visual fields were obtained with the Humphrey perimeter and the Frisén ring perimeter, respectively. Each test was judged according to the Glaucoma Hemifield Test (a statistical visual field analysis method) to be outside normal limits (abnormal) or not outside normal limits (normal or borderline). RESULTS: Under these conditions, both tests identified 19 of 34 (56%) glaucoma eyes as outside normal limits. High-pass resolution perimetry determined that 34 of 36 (94%) normal eyes were not outside normal limits; standard perimetry determined that all 36 normal eyes were not outside normal limits. High-pass resolution perimetry determined 12 of 37 (32%) eyes that were glaucoma suspects were outside normal limits; standard perimetry determined three of the 37 (8%) glaucoma suspect eyes were outside normal limits. Overall agreement between the two tests was 65%. CONCLUSION: With the Glaucoma Hemifield Test, high-pass resolution perimetry was comparable to standard perimetry in sensitivity and specificity, and identified a slightly higher percentage of patients at risk for glaucoma as abnormal. These results suggest that high-pass resolution perimetry should continue to be explored as an alternative to standard perimetry for the diagnosis and treatment of glaucoma.

Female↗
PubMed1990

Duration of breast-feeding patterns established in the hospital. Influencing factors. Results from a national survey.

Data from a national survey of new mothers were analyzed to determine the effect that demographic characteristics, breast-feeding instructions, and infant formula discharge kits had on breast-feeding patterns established in the hospital. Results indicated that mothers who exclusively breast-fed their infant were more likely to be affluent, college educated, and not working outside the home. Mothers who exclusively breast-fed their infants in the hospital and subsequently practiced partial breast-feeding or formula, or cow's milk feeding were more likely to return to the work force within the first 6 postpartum months. Mothers who partially breast-fed their infants in the hospital were more likely to have a low-birth-weight neonate. Stepwise logistic regression analysis indicated that greater total family income, a better education, and having more than one child had positive significant effects on exclusive breast-feeding by the first and fourth month. Women who received a formula discharge kit compared with those who did not had a slightly higher probability of initiating partial breast-feeding (10 vs. 7% by the first month; 27 vs. 25% by the fourth month). Maternal employment had a large impact on duration of exclusive breast-feeding. By the fourth month, mothers who were employed had a higher probability of initiating partial breast-feeding (43 vs. 19%) compared with mothers who were not in the work force.

Animals↗
PubMed1989

The pediatric marketplace.

This study presents an overview of the demography of office-based pediatricians, trends in the patient population, and the growth of the pediatricians' market share of children seeking primary medical care. The following four factors bear directly on the present and future status of the office-based pediatric practice: (1) size of the office-based pediatrician population, (2) size of the pediatric patient population, (3) the frequency of patient visits, and (4) the pediatric market share. Results indicate that the pediatricians' market share of young children has continued to grow. However, the pediatricians' share of young children has not grown fast enough to offset an increase in the pediatrician population. Continued growth of the pediatric practice may depend on developing effective marketing strategies and providing more primary care to the adolescent population.

Adolescent↗
PubMed1989

Breast-feeding and the working mother: a profile.

Based on a survey of a nationally representative sample of new mothers, this study compares the incidence and duration of breast-feeding among mothers who were employed full-time outside the home with those not employed. Results indicated that the same proportion of mothers (55%) who were employed full-time as those not employed reported breast-feeding their infants in the hospital. Working full-time seemed to have a substantial impact on breast-feeding duration. Only 10% of full-time employed mothers breast-fed their infants at 6 months of age compared with 24% of those not employed. Analyses of breast-feeding by demographic characteristics indicated that in-hospital breast-feeding was relatively high among mothers who were not working outside the home and who were 30 years of age and older, in high family income groups, college educated, white, and living in the Mountain or Pacific region of the United States. Breast-feeding patterns among white and black mothers showed that a relatively high incidence of in-hospital breast-feeding was reported by black mothers who returned to work full time. Many more blacks than whites who were working full time were in those demographic subgroups that reported the highest incidence of breast-feeding: mothers who were 25 years of age and older, in high-income groups, and college educated. Ways to increase the level of breast-feeding among employed mothers are outlined.

Adult↗
PubMed1987

Physical growth of infants 7 to 13 months of age: results from a national survey.

This study considers measurements of weight, recumbent length, head circumference, triceps skinfold, and arm circumference of 1,100 infants aged 7 to 13 months from a cross-sectional sample representative of the U.S. infant population. Based on these data, smoothed percentiles of weight, recumbent length, head circumference, triceps skinfold, and arm circumference by sex and age (in months) and weight for recumbent length were calculated. Compared with the percentile values from the National Center for Health Statistics (NCHS; Hamill et al., 1977, DHEW Publ. No. PHS 78-1650), percentile values from the 1984 Ross Laboratories Infant Nutrition Survey (RNS) for weight, recumbent length, and weight for recumbent length tended to be smaller (p less than .05). We attribute these variations to differences in sampling design and conclude that they are not of sufficient magnitude to warrant new growth charts. Smoothed percentiles for triceps skinfold and arm circumference presented herein are new reference values that can be used for assessment of the nutritional and growth status of older infants.

Anthropometry↗
PubMed1987

Feeding low-fat milk during infancy.

Despite the widespread agreement that low-fat milk should not be used during infancy, there is a sizable portion of infants in the United States who were fed a diet that included low-fat milk (less than or equal to 2% fat). In 1985, 14% of infants 8 months old, 20% of infants 10 months old, and 32% of infants 12 months old were fed low-fat milk. The reasons given most often by mothers for low-fat milk use was their consideration that low-fat milk has less fat than whole cow's milk and that low-fat milk use was recommended/suggested by their physician. Nutrient intakes of infants fed low-fat milk are compared to those of infants fed whole cow's milk and infant formula. Except for fat, nutrient intakes of infants fed low-fat milk or whole cow's milk were similar. A majority of infants fed either low-fat milk or whole cow's milk received amounts of sodium, potassium, and chloride that exceeded the recommended safe and adequate ranges and amounts of iron below the RDA. These data are considered in relation to dietary requirements during infancy.

Animals↗
PubMed1985

Nutrient intakes of American infants and children fed cow's milk or infant formula.

Between April 1984 and August 1984, a national survey, the Ross Laboratories Infant Nutrition Survey, was undertaken to assess patterns of food consumption of American infants ranging in age from 6.5 months to 13.4 months. Nutrient intakes of 865 infants were evaluated according to different foods (milk and milk products, non-iron-fortified formula, iron-fortified formula, infant cereal, commercial baby foods, and home-prepared table foods). Results indicated that most American infants consumed nutrients in appropriate amounts. However, a large proportion of infants who were fed a diet that included cow's milk received amounts of sodium, potassium, and chloride that exceeded the recommended safe and adequate ranges. The median intake of iron of infants fed either cow's milk or a non-iron-fortified formula was below the recommended dietary allowance; a low percentage of these infants received medicinal iron supplementation. The results also indicated that the median estimated renal solute load of the diet of infants fed cow's milk was approximately twice the amount of that of infants fed formula. These data may be useful in the development of nutritional programs for older infants.

Animals↗
PubMed1985

Nutrient intakes of formula-fed infants and infants fed cow's milk.

Twenty-four-hour dietary intake data from the second National Health and Nutrition Examination Survey (NHANES II), 1976-1980, were analyzed to compare nutrient intakes among infants 7 to 12 months of age who were fed mixed diets containing solid foods and either infant formula or cow's milk. Solid foods fed to the infants in both groups were low in iron and linoleic acid, and high in sodium, potassium, and protein, relative to Recommended Dietary Allowances. Infants who were fed cow's milk received lower median intakes of iron (7.8 mg v 14.9 mg), linoleic acid (1.8 g v 6.1 g), and vitamin C (39 mg v 64 mg), and higher median intakes of protein (41 g v 25 g), sodium (1,000 mg v 580 mg), and potassium (1,630 mg v 1,020 mg) than formula-fed infants. Seventy-five percent of the infants fed cow's milk had iron intakes below the Recommended Dietary Allowance; 69% had sodium intakes above the range of estimated safe and adequate daily dietary intake. Linoleic acid provided less than 3% of energy intake for 74% of the infants fed cow's milk. Differences in nutrient intakes were due not only to different concentrations of nutrients in each of the milk feedings but also to the different amounts and types of solid foods fed to the two groups of infants.

Animals↗
PubMed1985

Nutrient intake in the United States during the first 12 months of life.

Nutrient intakes of 463 infants ranging in age from 1 week to 12 months from the Nationwide Food Consumption Survey 1977-78 were evaluated according to different foods (milk and milk products, noniron-fortified formula, iron-fortified formula, infant cereal, commercial baby foods, and table foods). Breast-fed infants and infants fed a combination of cow's milk and formula were excluded. Results indicated that iron was the nutrient most often consumed in amounts less than the RDA. Infants fed a diet that included either cow's milk or noniron-fortified formula had a median iron intake less than the recommended allowance. In comparison, infants who were fed an iron-fortified formula had a median iron intake well above the RDA. The relative proportion of iron derived from different foods is discussed.

Animals↗
PubMed1985

1984 milk-feeding patterns in the United States.

This paper presents results of surveys conducted continuously during a period of years to assess the trend in the incidence of breast-feeding. From 1955 to 1984, questionnaires were mailed to a large nationally representative sample of mothers to determine the use of various milks for feeding infants during the first 6 months of life. Data from these surveys demonstrated the resurgence of breast-feeding both in incidence and duration through 1982. From 1982 through 1984, these increases continued but at a markedly reduced level.

Animals↗
PubMed1983

1981 milk feeding patterns in the United States during the first 12 months of life.

From 1955 to 1981, questionnaires were mailed to a nationally representative sample of mothers to determine the use of various milks for feeding infants during the first 6 months of life. Data from these surveys demonstrated the resurgence of breast-feeding both in incidence and duration, and this increase has occurred across all levels of income and education. Statistical analysis indicated that the trends were significant (P less than .01) for all demographic categories surveyed. In 1981, as in 1980, a bimonthly telephone survey of mothers of infants 8, 10, and 12 months of age determined milk use during later infancy. A combination of data from the mail and telephone surveys for 1981 provided information on milk feeding patterns and demographic characteristics for the first 12 months of life. Maternal employment was shown to reduce the incidence and duration of breast-feeding.

Animals↗
PubMed1982

The recent trend in milk feeding among WIC infants.

The type of milk fed infants from birth to six months of age was ascertained by quarterly surveys of a national sample of births. WIC (Women, Infants and Children Program) participants were identified from this sample, and trend data indicate that an increased percentage of WIC mothers ae choosing to breastfeed their infants. Infant formula use has declined in the early months of life, but increased at the expense of cow's milk toward the middle of the first year.

Adult↗
PubMed1981

1980 update: the recent trend in breast-feeding.

This study presents results of surveys conducted on a continuous basis over a period of years to determine the trend in the incidence of breast-feeding. Questionnaires were mailed to large samples of mothers, representative of the national distribution of births, asking them what type of milk they fed their infants over a period of time. Demographic characteristics of mothers who breast-fed were also obtained. From 1955 to 1971, there was a progressive decline in breast-feeding, followed by a resurgence of its incidence through 1979. Not only are more mothers breast-feeding, more are continuing to do so for a longer period of time throughout the months of their infants' most rapid growth and high nutritional requirements. It is also apparent that the increased incidence of breast-feeding has not been limited to higher income, better educated mothers.

Bottle Feeding↗
PubMed1981

Milk feeding patterns in the United States during the first 12 months of life.

From 1955 to 1980, mail questionnaires were administered to a nationally representative sample of mothers to determine the use of various milks for feeding infants during the first 6 months of life. Data from these surveys have demonstrated the resurgence of breast-feeding both in incidence and duration, and this increase has occurred across all income and educational levels. Statistical analysis indicated that the trends were significant (P less than .01) for all demographic categories surveyed. In January 1980, a bi-monthly telephone survey of mothers of infants 8, 10, and 12 months of age was initiated to determine milk use during later infancy. A combination of data from the mail and telephone surveys for 1980 provided information on milk feeding patterns for the first 12 months of life.

Animals↗