Rates of drinking, illicit drug use and risky sexual behaviour were greater in the later cohort, with increases generally larger among girls than boys but few differences according to SES. 19 20 It is possible that as the prevalence (and so normative nature) of behaviours changes, 21 so might their clustering.
Increasing proportions reporting multiple health-risk behaviours are to be expected, given higher rates of all individual risk behaviours, except smoking, in the later cohort.
Despite much higher rates of drinking, drug use and risky sexual behaviour (but not smoking) in the later cohort, relationships between use of each substance and risky sexual behaviour showed little or no change over time.
As previously reported, 19 20 rates of drinking, illicit drug use and sexual risk behaviour were considerably higher in the later cohort (table 1).
Differential consistency refers to 'the extent to which scores for behaviour in a given context at a given time are correlated across individuals with scores for the same behaviour in the same context at a later time' [ 13, 24] and can also be called repeatability.
Previous STI test results could have influenced later sexual behaviour in the direction of less or increased risk causing a slight attenuation in the observed odds ratio estimates.
By classifying the tasks that designers complete throughout the design process, analysis has demonstrated two different approaches to creative behaviour in later stage design; dependent on the way in which designers identify, develop and use knowledge and design variables.
Later studies of everyday behaviour in the era of television dominance seem to indicate the opposite.
The couple's later book, Crisis: Heterosexual Behaviour In The Age Of Aids (1988), co-written with Robert C Kolodny, provoked another storm, this time from Aids researchers and health workers who disputed their findings.
Male rats were preferentially selected to avoid the confounding effects of fluctuating hormones during the female oestrus cycle on brain function and behaviour in later experiments.
