Assessment of risk for pelvic inflammatory disease in an urban sexual health population -- Marks et al. 76 (6): 470 Data Supplement - ADDITIONAL DATA -- Sexually Transmitted Infections

ADDITIONAL DATA
Assessment of risk for pelvic inflammatory disease in an urban sexual health population
C Marks, R L Tideman, C S Estcourt, G Berry, A Mindel
Sexually Transmitted Infections 2000;76:470-473.

Variables independently associated with presumptive PID using logistic regression analysis

	Crude OR (95% confidence interval)*	Adjusted OR (95% confidence interval)*
Country of birth (n=1445)		Chi²₇=19.38, p=0.007
Australia and New Zealand	Reference group	1.0
Polynesia and Melanesia	2.2 (0.84 to 5.88)	1.4 (0.47 to 4.37)
Europe and UK	1.0 (0.69 to 1.32)	1.2 (0.81 to 1.75)
North and South East Asia	5.6 (4.25 to 7.42)	2.8 (1.70 to 4.46)
Central Asia and Middle East	1.0 (0.31 to 2.99)	0.7 (0.18 to 2.36)
South America	2.6 (1.19 to 5.83)	2.5 (1.00 to 6.33)
North America	0.6 (0.24 to 1.62)	0.8 (0.30 to 2.31)
Africa	2.5 (0.81 to 7.65)	1.5 (0.42 to 5.33)
Age (years) (n=1481)		Chi²₅=120.23, p=0.0001
15 to 19	4.2 (2.31 to 7.78)	5.3 (2.76 to 10.11)
20 to 24	1.6 (1.21 to 2.12)	1.9 (1.37 to 2.60)
25 to 29	Reference group	1.0
30 to 34	0.7 (0.50 to 0.91)	0.5 (0.38 to 0.77)
35 to 39	0.4 (0.26 to 0.57)	0.3 (0.20 to 0.50)
>39	0.3 (0.20 to 0.46)	0.3 (0.16 to 0.45)
English spoken at home (n=1453)		Chi²₁=4.25, p=0.039
Yes	Reference group	1.0
No	5.1 (3.90 to 6.71)	1.6 (1.02 to 2.55)
History of PID (n=1482)		Chi²₁= 48.64, p=0.0001
No	Reference group	1.0
Yes	4.0 (2.57 to 6.18)	5.9 (3.59 to 9.73)
History of genital warts (n=1482)		Chi²₁=11.46, p=0.0007
No	Reference group	1.0
Yes	0.5 (0.36 to 0.62)	0.6 (0.42 to 0.79)
Contraception currently used (n=1372)		Chi²₆=24.79, p=0.0004
Hormonal	Reference group	1.0
IUCD	1.3 (0.72 to 2.51)	4.5 (2.14 to 9.39)
Diaphragm/cap	0.2 (0.06 to 0.55)	0.4 (0.12 to 1.29)
Condoms	1.0 (0.74 to 1.22)	1.4 (1.03 to 1.87)
Hormonal plus barrier	1.3 (0.84 to 1.93)	1.3 (0.76 to 2.08)
None	1.0 (0.69 to 1.34)	1.8 (1.20 to 2.76)
Not needed	0.4 (0.30 to 0.69)	1.2 (0.73 to 1.98)
Interaction of country of birth and commercial sex work (n=572)*		Chi²₂=6.29, p=0.043
Europe and UK x sex work	1.0 (0.27 to 3.81)	1.0 (0.22 to 4.81)
North and South East Asia x sex work	12.9 (7.73 to 21.45)	2.8 (1.22 to 6.22)

*Interaction only considered where numbers were large enough to enter the term in the logistic regression model