Table 1.

Sample description using the long dataset (one record per patient for each year being in treatment)

	Group size according to first subject record		Number of records (mean)		Age in years (mean; using all records)
	Complete dataset	Imputed dataset	Complete dataset	Imputed dataset	Complete dataset	Imputed dataset
Female, non-Swiss, non-injector	185	215.3	5.07	4.95	31.9	32.0
Female, non-Swiss, ever injector	188	225.5	5.71	5.20	34.2	33.9
Female, Swiss, non-injector	1,105	1,298.4	7.60	7.33	33.2	33.2
Female, Swiss, ever injector	1,505	1,738.2	7.26	6.81	34.0	33.9
Male, non-Swiss, non-injector	941	1,124.5	6.14	5.86	33.2	33.2
Male, non-Swiss, ever injector	830	984.9	5.25	4.96	34.8	34.7
Male, Swiss, non-injector	2,245	2,643.0	7.98	7.70	34.2	34.0
Male, Swiss, ever injector	2,733	3,192.2	7.30	6.94	36.0	35.9