The Edinburgh Addiction Cohort: recruitment and follow-up of a primary care based sample of injection drug users and non drug-injecting controls

Table 2 Follow-up status of cases and comparison of the current health status of cases and controls

Follow-up status of cases	N = 794 (%)	% Interviewed (N = 432)
Deceased	228 (28.7)	0.1^a
Interviewed	432 (54.4)	100
Case notes available	654 (82.2)	100
Lost to follow-up	139 (17.5)	-
Mean years follow-up	10.2 (SD 6.8, range < 1-25)
Current injector	135	31.3
Current OST	302	70.0
Opiate free¹	75	17.4
Controls vs. cases health status	% Controls (n = 432)	% Cases (n = 432)
Smoker	255 (59.0)	403 (93.2)*
High risk alcohol use²	60 (13.9)	87 (20.1)#
Anxious³	87 (20.1)	209 (48.3)*
Depressed⁴	49 (11.3)	114 (26.4)*
Mean subjective QoL (SD)⁵	63.8 (22.7)	50.3( 23.6)^

Notes: a: Five interviewees subsequently died before the end of the follow-up period. 1. Not in OST or injecting illicit opiates 2. Based on AUDIT score of ≥ 16 which indicates high risk or harmful drinking in the past year [48] 3. Based on a HADS anxiety subscale score ≥ 11 indicating caseness [49] 4. Based on a HADS depression subscale score ≥ 11 indicating caseness [49] 5. Mean EqVAS score, where a score of 0 is worst imaginable health state and of 100 is best imaginable health state[50]. Chi square test for difference: # p < 0.01, *p > 0.001, ^ t-test for equality of means: p < 0.001.

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