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F Verhage

Publications and source records attributed to F Verhage.

62 records · Page 4Linked to original sources
PubMed1984

Regularity of dental attendance in the Netherlands related to preference for preservation of teeth.

In order to study the relationship between regularity of dental attendance and the value attached to the retaining of the teeth, a survey has been carried out among 25-yr-olds in Amsterdam. The value attached to retention was operationalized threefold and was analyzed with, among others, principal component analysis for discrete variables (HOMALS). It has been found that regular dental attenders, compared to irregulars, give a higher priority to retention of the teeth than to other items, are willing to spend a larger amount of money to prevent loss of the teeth, and have a greater aversion to full dentures at both the present age and when 50 yr old. These findings are discussed. Based upon measures of association between the three operationalizations of the value attached to retention of the teeth, it is suggested that these operationalizations deal with different aspects of the attitude towards full dentures.

Adult↗
PubMed1984

Cross validation of model predicting (ir)regularity of dental attendance.

A theoretical model developed for the prediction of (ir)regular dental attendance was evaluated with loglinear models (logit approach). The model found is identical to the model developed previously. The prediction of (ir)regularity, however, proved to be unsatisfactory. The disappointing result is attributed to the difficulty of measuring the predictors adequately, and to the possibility that additional variables might be needed.

Dental Care↗
PubMed1983

Differentiating regular from irregular dental attenders of either sex by linear discriminant analysis.

The present article describes an attempt to improve the prediction of dental attendance, results by using an additional number of variables and performing discriminant analyses, done separately for men and women. It appears that regular and irregular dental attenders might be discriminated on the basis of mathematically combined variables and interactions. The (number of) variables selected by the analysis to differentiate regular from irregular male attenders differ(s) from those selected for female attenders. About 80% of all respondents can be classified correctly, but this is largely due to the assignment of actual regulars to classified regulars. The use of differing sets of prior probabilities affects the classification results, namely, either the classification of the regulars or that of the irregulars improves. In the discussion attention is given to the seemingly contradictory results of the Mann-Whitney tests per variable on the one hand and the discriminant analyses on the other. In this connection, the finding that 'education' plays a different role for men than for women is discussed. The validity of the variable 'last visit' is dubious. It is concluded that when differentiating regulars from irregulars, a division of the respondents according to sex makes sense because of the (number of) variables associated with their regular dental attendance. Furthermore, it seems warranted to say that the classification of the irregulars fails because the reversed scores on the variables with which the regulars are classified don't contain all information needed for the prediction of irregular dental attendance. Lastly, notwithstanding the use of more variables in the present study, the results are not better than those in the previous one, in which just three factors were used.

Adolescent↗
PubMed1980

Three factors predicting irregular versus regular dental attendance: a model fitting to empirical data.

A tentative theory, based upon the results of a survey that was performed in an urbanized village in the Netherlands, and proposing that the (ir)regularity of dental attendance is predicted by 1) dental anxiety, 2) the family dental health pattern and 3) the preference for preservation of the teeth, has been explored with loglinear models (logit approach). It has been shown that dental anxiety in combination with preference for preservation of the teeth is significantly associated with the (ir)regularity, but the family dental health pattern has a modifying effect. The probabilities of being an irregular dental attender were estimated for the levels discernible in the two predictor variables and with the odds of irregular dental attendance corresponding 95% confidence intervals were approximated. The results were discussed and it seems warranted to conclude that (ir)regular dental attendance dependent on the levels of the variables, mentioned above, is predicted more or less accurately. A further exploration of the theory and the variables involved seems worthwhile.

Adolescent↗
PubMedDate not supplied

Psychological effects of presymptomatic DNA testing for Huntington's disease in the Dutch program.

This study assessed the 6-month follow-up effects of presymptomatic DNA testing for Huntington's disease (HD) in 73 individuals at 50% prior risk who were identified either as carriers of the HD gene (N = 29) or as noncarriers (N = 44). The subject's knowledge of being a gene carrier was expected to induce intrusive emotions, denial-avoidance behavior, and pessimistic expectancies of the future and adjustment problems. The Impact of Event Scale, the Beck Hopelessness Scale, and the General Health Questionnaire were used as standard measures of psychological distress. At the disclosure of the test results, carriers had a strong increase in pessimistic expectations but showed a decline to baseline levels 6 months later. Noncarriers reported a steep decline in hopelessness compared with their pretest conditions but had increased scores after 6 months. Six months after the disclosure of the test results, both gene carriers and noncarriers reported a significant decrease in unwanted intrusive thoughts about HD. Carriers showed a slight increase in denial-avoidance behavior, whereas noncarriers showed a clear decrease. Our observations might indicate that tested individuals found relief from the prior psychological distress and that they were able to acknowledge the impact of the test result on their future. An unresolved question is how the foreknowledge will affect carriers as they approach the impending onset of the disease. Longer observation periods (> 6 months after disclosure) are required to study changes of the impact of DNA test results over time.

Adult↗
PubMedDate not supplied

Age migraine and achievement motivation related? A psychophysiological study of responses to real-life achievement stress in young headache sufferers.

Achievement motivation and its physiological correlates were studied in 37 young migrainous headache sufferers (30 females and 7 males) and in 37 matched controls. Temporal and digital pulse amplitude, the EMGs of the m. frontalis, anterior temporalis and corrugator supercilii, heart and respiration rate, head temperature and electrodermal activity were measured during an adaptation session, an examination and an intelligence test. An abnormal response in the temporal artery, which was present in the migrainous headache sufferers, was not associated with achievement motivation. But the latter was positively associated with a high skin conductance level, a greater number of spontaneous skin conductance responses (SCRs) during the examination and a lower digital pulse amplitude in both the migrainous headache and control groups. Higher sympathetic activity in subjects with high achievement motivation was interpreted as an indication of greater mental effort and is a possible contributory factor to an attack in those with migraine.

Achievement↗