Table 1.

Demographic and Clinical Characteristics of Prison Survey Sample

Study sample (n = 315)	Responders (n = 194)	Non respondersa (n = 121)	p
Men, n (%)	194 (100)	121 (100)
Age, medianb (IQR), y	31.3 (14)	29.4 (12)	.028d
Conviction time, medianb (IQR)c, months	69 (66)	60 (54)	.030d

^aNon-responders were defined as those approached but actively refused to take part, those who consented but not returned questionnaires, and those who returned unanswered questionnaires; ^bMedians were used as measures of central tendencies as age and conviction time were non-normally distributed; ^c IQR: Interquartile range; ^dMann-Whitney U-test was employed due to non-normal distributed data.