. 2014 Oct 7;49(6):645–653. doi: 10.1093/alcalc/agu066

Table 2.

Number of meetings attended at baseline, 3, 6 and 12 months stratified by primary substance

Fellowship	Average number of meetings attended*
	Alcohol		Cannabis		Opiates		Stimulants		χ²	P
	Mean ± SD	Median	Mean ± SD	Median	Mean ± SD	Median	Mean ± SD	Median	χ²	P
Any fellowship
Baseline	7.25 ± 17.66	0.00	5.25 ± 14.71	0.00^a	10.95 ± 20.95	0.00^b	7.63 ± 19.74	0.00	8.59	0.035
3 months	30.66 ± 27.29	28.00	24.06 ± 20.19	21.00	29.98 ± 25.24	25.00	33.44 ± 30.99	27.00	1.99	0.575
6 months	31.66 ± 34.80	25.50	29.66 ± 32.28	20.50^c	42.49 ± 34.11	39.00	53.24 ± 45.58	45.50^b	11.30	0.010
12 months	50.05 ± 50.67	31.50	46.48 ± 52.24	27.50	65.63 ± 56.06	60.00	76.65 ± 86.20	58.00	4.82	0.186
Alcoholics Anonymous
Baseline	6.84 ± 16.62	0.00	3.64 ± 10.99	0.00^a	7.89 ± 16.65	0.00^b	5.15 ± 14.78	0.00	11.48	0.009
3 months	27.44 ± 24.98	23.00	18.24 ± 16.18	16.00	24.46 ± 23.16	19.00	26.22 ± 27.45	20.00	3.89	0.274
6 months	28.53 ± 32.23	20.50	25.66 ± 28.45	18.00	32.32 ± 31.80	24.00	42.12 ± 43.98	37.50	3.42	0.331
12 months	46.94 ± 50.05	27.50	42.00 ± 51.51	18.00	42.83 ± 45.43	28.00	61.57 ± 78.49	40.00	1.30	0.728
Narcotics Anonymous
Baseline	0.41 ± 2.07	0.00^a	1.60 ± 4.84	0.00	3.06 ± 9.84	0.00^d	2.48 ± 7.77	0.00	13.80	0.003
3 months	3.17 ± 5.95	0.00	5.82 ± 10.67	0.50	5.53 ± 9.30	0.00	7.22 ± 11.93	3.00	4.28	0.233
6 months	3.13 ± 9.98	0.00^a,c	4.00 ± 8.75	0.00	10.83 ± 20.48	0.00^d	11.12 ± 21.71	0.00^d	14.90	0.002
12 months	3.11 ± 12.38	0.00^a	4.48 ± 11.39	0.00	22.80 ± 50.19	0.00^d	15.08 ± 36.53	0.00	15.54	0.001

^aSignificantly different from opiate group.

^bSignificantly different from cannabis group.

^cSignificantly different from stimulant group.

^dSignificantly different from alcohol group.

*Comparisons of number of meetings attended were conducted using the non-parametric Kruskal–Wallis Test.