The PsyCoLaus study: methodology and characteristics of the sample of a population-based survey on psychiatric disorders and their association with genetic and cardiovascular risk factors

Table 1 Power for the analysis of the associations between two dichotomous variables (%)

Prevalence of the index disorder	Relative risk for the presence of the dichotomous correlate in individuals with the index disorder	Frequency of dichotomous correlates
		1%	3%	5%	10%	15%	25%	50%	75%	90%	95%
1%	1.5	9	12	14	18	21	26	28	18	8	5
	2	17	25	31	43	52	63	70	52	21	9
	2.5	25	39	49	66	77	88	93	83	41	16
3%	1.5	12	19	25	37	46	58	67	51	23	12
	2	26	45	59	80	90	97	99	97	70	36
	2.5	40	68	83	96	99	100	100	100	96	69
5%	1.5	15	26	35	53	65	79	88	76	41	20
	2	34	61	78	94	98	100	100	100	93	64
	2.5	53	85	95	100	100	100	100	100	100	94
10%	1.5	21	42	57	81	91	98	100	98	76	46
	2	51	87	97	100	100	100	100	100	100	96
	2.5	77	99	100	100	100	100	100	100	100	100
15%	1.5	28	57	75	94	99	100	100	100	94	69
	2	67	97	100	100	100	100	100	100	100	100
	2.5	91	100	100	100	100	100	100	100	100	100
20%	1.5	35	71	88	99	100	100	100	100	99	86
	2	80	100	100	100	100	100	100	100	100	100
	2.5	98	100	100	100	100	100	100	100	100	100
25%	1.5	42	82	95	100	100	100	100	100	100	95
	2	91	100	100	100	100	100	100	100	100	100
	2.5	100	100	100	100	100	100	100	100	100	100

ISSN: 1471-244X