Increasing incidence of pregnancy among women receiving HIV care and treatment at a large urban facility in western Uganda

Table 4 Rates of pregnancy per 1000 person years with crude Hazard ratios for the predictor variables

Variable	Pregnancies per year	Rates/1000 PY	Crude HR (95% CI)	p-value
Calendar year
2006	4	29.9	1
2007	42	52.8	1.77 (0.63 – 4.92)	0.277
2008	127	87.4	2.92 (1.08- 7.91)	0.035*
2009	190	100.7	3.36 (1.25 – 9.07)	0.016*
2010	99	122.6	4.10 (1.5-11.15)	0.006
Year of enrollment
2006	75	63.5	1
2007	175	91.3	1.43 (1.09 – 1.88	0.009*
2008	136	100	1.57 (1.19 – 2.08)	0.002*
2009	76	125.7	1.97 ( 1.43-2.7)	<0.0001*
2010	0
Disclosure
No	29	77	1
Yes	126	102	1.33 (0.89–1.99)	0.160
Missing	307	88.1	1.14 (0.78 – 1.68)	0.485
Children alive
5 and above	274	93.5	1
2 - 4 children	116	72.7	0.78 (0.63 – 0.97)	0.023*
1 child	72	128.5	1.37 (1.06 - 1.78)	0.016*
Weight (kg)
Less than 50	71	65.1	1
50 -60	201	97.4	1.49 (1.14-1.96)	0.004*
61 -71	110	93.3	1.43 (1.063-1.93)	0.018*
Above 71	47	72.6	1.11 (0.77 – 1.61)	0.56
CD4 cell count at enrollment
Less than 100	57	77.85	1
100 – 250	113	97.74	1.21 (0.88-1.66)	0.233
251 – 350	74	98	1.21 (0.86-1.72)	0.265
Greater than 350	185	78	0.97 (0.72-1.35)	0.854
Difference in CD4 between most recent and enrollment counts
Less than 100	58	243.7	1
100 – 250	8	72.9	0.29 (0.14-0.62)	0.001*
251 - 350	2	45.2	0.18 (0.45- 0.76)	0.019*
Greater than 350	394	84.1	0.34 (0.26 - 0.45)	<0.0001*

ISSN: 1742-4755