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L L Hayman

Publications and source records attributed to L L Hayman.

9 recordsLinked to original sources
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Nursing↗
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Type A behavior in children: psychometric properties of the Matthews Youth Test for Health.

The purpose of this study was to investigate the psychometric properties of the Matthews Youth Test for Health (MYTH) as a measure of components of Type A behavior in school-age children. The sample consisted of 216 middle-class, white, 6 to 11 year old, same-sex twin children. Pairs were randomly split into two subgroups for cross-validation. The MYTH was completed by 88% of the children's teachers. The Perceived Competence Scale was completed by 118 of the 124 children 8 to 11 years old; a parallel form of this instrument was completed by teachers of 108 of these children. The 17 items of the MYTH instrument were factor analyzed. Two factors, Impatience-Aggression and Competitive Achievement-Striving, were derived and cross-validated. These MYTH factors were internally consistent and replicated previous studies of school-age children. The construct validity of the MYTH subscales was partially supported by evidence of relationships between these components of Type A behavior and teacher-ratings of the child's competence in specific domains. Children's ratings of their competence and perceptions of global self-worth were not related to total MYTH scores or subscale scores.

Child↗
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Genetics or environment? Type A behavior and cardiovascular risk factors in twin children.

The heritability of Type A behavior and other cardiovascular risk factors was investigated in twin school-age children. The purpose was to differentiate those risk factors that have the potential to respond to environmental and life-style changes. The sample consisted of 71 monozygotic and 34 same-sex, dizygotic twin pairs 6 to 11 years old residing in the Philadelphia metropolitan area. Systolic and diastolic blood pressure, triceps skinfold thickness, body mass, and fasting blood specimens for lipid profiles were collected during home visits. Teachers rated the children's Type A behavior and two of its subcomponents, impatience-aggression and competitive achievement-striving, using the Matthews Youth Test for Health. Statistically significant heritability estimates were found for Type A behavior and its subcomponents, triglycerides, systolic blood pressure, and body mass. Nevertheless, there was substantial environmental influence on these risk factors. The greatest environmental influence was observed for HDL-cholesterol, LDL-cholesterol, apolipoprotein-B and diastolic blood pressure.

Anthropometry↗
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Type A behavior and physiological cardiovascular risk factors in school-age twin children.

The relationship of Type A behavior pattern (TABP) and its components to physiological cardiovascular disease (CVD) risk factors of blood pressure, obesity, and lipids and lipoproteins was examined in 112 pairs of twin children. Blood pressure, triceps skinfold thickness, and fasting venous specimens for lipid profiles were collected during a home visit. Teachers rated children's Type A-B behaviors using the Matthews Youth Test for Health (MYTH) (Matthews & Angulo, 1980). For statistical analyses, one member of each twin pair was assigned to Group I and the co-twin to Group II. In Groups I and II, significant, p less than or equal to .01, negative correlations between the impatience-aggression component of TABP and atherogenic lipids were observed before and after covariate adjustments. Children were classified as MYTH Type A or B on the basis of a median-split. Marginally significant differences (B greater than A) were found between the mean lipid levels of Type A and Type B children. No significant A-B differences in blood pressure or measures of obesity were observed in either group. Multivariate analysis of variance results suggested that lipid profiles in Group I differed significantly, p less than or equal to .02, by Type A-B classification. The results of this study suggest that TABP and its components are not positively associated with physiological risk factors for CVD; and the impatience-aggression component of TABP is associated with lower levels of atherogenic lipids.

Apolipoproteins B↗