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The prevalence, lifetime risk, and concomitant co-morbidities determine the burden of the disease [ 3, 6– 8].
Therefore, the aims of the study were to determine the prevalence (lifetime, point, recurrent) and the nature of recurrent NSLBP reported by adolescents in secondary schools.
It is difficult to compare the prevalence of psychiatric illness because studies use different definitions, such as 12 month prevalence, lifetime prevalence, and point prevalence.
Physiotherapy students enrolled in one Australian tertiary institution completed a validated self-administered questionnaire in April 2001, seeking information on LBP prevalence (lifetime, 12 month, one-month, one-week), and its risk factors.
Sample sensitivity analysis was conducted post-hoc [ 32, 33] to determine the adequacy of the sample to provide robust estimates of differences in LBP prevalence (lifetime, 12 month and one-month) across the four year levels with at least 80% power [ 34].
The prevalence (lifetime occurrence) rate of cancers of the reproductive system (uterus, ovary, cervix and vagina) and breast cancer was determined for 5,398 living alumnae, 2,622 of whom were former college athletes and 2,776 non-athletes, from data on medical and reproductive history, athletic training and diet.
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Lifetime prevalence rates or lifetime risks were not estimated.
The prevalence of lifetime diagnosis of any anxiety disorder was 4.9% (n=580), and the prevalence of lifetime depressive disorders was 5.3% (n=651).
One might wonder why the prevalence of lifetime migraine in 2002 was unexpectedly high in our study compared with the lifetime prevalence in the other developed countries.
The individual and societal costs of headache disorders in children and adolescents are due to the high incidence, prevalence and lifetime prevalence of these conditions.
The prevalence of lifetime headache and headache in the last 12 months was 81.11 and 67.22 %, respectively.
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