Table 2

Risk factors for bacterial STI (chlamydia and/or gonorrhoea) among Indigenous WPHC participants 15 years and older

			Unadjusted			Adjusted
Independent variable	No	No of cases	Prevalence (%)	OR (95% CI)	p Value	OR (95%CI)*	p (exact two sided)
*Adjusted for clustering at the community level.
†SEIFA score was categorised in units of 100 and each decrease of 100 units results in an estimated adjusted OR of 1.16.
‡Alcohol consumption at unsafe levels among those who had consumed alcohol in the week before the survey.
Sex
Male	1361	116	8.5	1.00		1.00
Female	1456	151	10.4	1.24 (0.96 to 1.60)	0.10	1.51 (1.15 to 1.93)	0.001
Age (years)
15–19	318	73	23.0	8.11 (5.04 to 13.03)	<0.01	7.78 (4.77 to 12.67)	<0.001
20–24	364	71	19.5	6.59 (4.22 to 10.29)	<0.01	5.50 (3.41 to 8.85)	<0.001
25–29	366	37	10.1	3.06 (2.02 to 4.62)	<0.01	2.49 (1.53 to 4.05)	<0.001
30–34	350	25	7.1	2.09 (1.32 to 3.33)	<0.01	1.78 (1.04 to 3.05)	0.036
35–39	319	22	6.9	2.02 (1.10 to 3.69)	0.02	1.78 (0.92 to 3.46)	0.087
40+	1100	39	3.6	1.00		1.00
Alcohol
yes	1916	219	11.4	2.14 (1.53 to 3.00)	<0.01	1.74 (1.27 to 2.39)	0.001
no	896	48	5.4	1.00		1.00
Smoking
yes	1681	201	12.0	2.20 (1.70 to 2.83)	<0.01	1.46 (1.14 to 1.87)	0.003
no	1133	66	5.8	1.00		1.00
SEIFA (CD scores)
500–700	1297	153	11.8	1.00		1.00
701–900	997	78	7.8	0.63 (0.39 to 1.02)	0.062	0.64 (0.38 to 1.07)	0.09
901+	523	36	6.9	0.55 (0.32 to 0.94)	0.03	0.47 (0.27 to 0.83)	<0.01
Categories†				1.20 (1.04 to 1.39)	0.011	1.16 (1.03 to 1.30)	0.015
Hospital
no	662	40	6.0	1.83 (1.16 to 2.90)	0.01	1.75 (0.91 to 3.38)	0.093
yes	2155	227	10.5	1.00		1.00
Resident population
0–100	190	10	5.3	0.42 (0.14 to 1.25)	0.12	0.45 (0.14 to 1.45)	0.335
101–200	798	71	8.9	0.74 (0.36 to 1.51)	0.40	0.66 (0.32 to 1.38)	0.739
201–300	502	61	12.2	1.04 (0.53 to 2.06)	0.91	0.93 (0.49 to 1.78)	0.824
301–400	346	23	6.7	0.54 (0.22 to 1.29)	0.17	0.83 (0.28 to 2.49)	0.271
401–500	281	20	7.1	0.58 (0.30 to 1.11)	0.10	1.71 (0.57 to 5.09)	0.182
501+	700	82	11.7	1.00		1.00
Resident MO
yes	744	50	6.7	0.62 (0.39 to 0.98)	0.04
no	2073	217	10.5	1.00
pop:RN ratio
0–200	910	94	10.3	1.00
201–400	646	54	8.4	0.79 (0.35 to 1.78)	0.57
401–600	552	48	8.7	0.83 (0.37 to 1.87)	0.65
>600	367	31	8.5	0.80 (0.46 to 1.38)	0.43
pop:HW ratio
0–100	386	28	7.3	1.00
101–200	1348	164	12.2	1.77 (0.96 to 3.27)	0.07
201–300	495	30	6.1	0.82 (0.37 to 1.86)	0.64
>300	394	31	7.9	1.09 (0.56 to 2.11)	0.79
Distance to centre
0–50 km	1209	120	9.9	1.11 (0.67 to 1.84)	0.68
51–100 km	498	50	10.0	1.13 (0.40 to 3.15)	0.82
101–200 km	266	21	7.9	0.87 (0.32 to 2.37)	0.78
>200 km	844	76	9.0	1.00
Road access
yes	1889	187	9.9	1.16 (0.66 to 2.04)	0.59
no	928	80	8.6	1.00
Unsafe drinker‡
yes	1146	143	12.5	1.52 (0.93 to 2.50)	0.081
no	256	22	8.6	1.00
Visiting SHS
yes	1618	190	11.7	1.51 (0.85 to 2.69)	0.16
no	445	36	8.1	1.00
Visiting SHS (freq)
1–4 visits	1452	158	10.9	1.00
>4	611	68	11.1	1.03 (0.69 to 1.54)	0.90
Visiting WHS
yes	2379	233	9.8	1.22 (0.67 to 2.20)	0.52
no	244	20	8.2	1.00
Visiting WHS (freq)
1–4 visits	1417	126	8.9	1.00
>4	992	88	8.9	1.00 (0.59 to 1.70)	0.99
Licensed liquor outlet
yes	2043	197	9.6	1.07 (0.68 to 1.69)	0.76
no	774	70	9.0	1.00
Condom availability (health centre)
yes	2547	250	9.8	2.65 (0.51 to 13.78)	0.25
no	76	3	4.0	1.00
Condom availability (community)
yes	580	53	9.1	0.93 (0.63 to 1.35)	0.69
no	2043	200	9.8	1.00