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Cohen's kappa statistic quantified questionnaire validity. In every, 33% (95% self-confidence period 27-39%) of members had definite insomnia 40% of females and 21% of males. The ISI (cut-off 12) and lots of KSQ-based diagnoses revealed very good quality (κ ≤0.74) up against the tentative, versus good validity (κ ≤0.61) against the definite interview diagnosis. Quick surveys, requiring a daytime symptom at the very least three times per week, may undervalue insomnia prevalence. Validity was regul