Table 2.

Estimated Prevalences and Crude and Adjusted^a Percent Prevalence Differences for Stress Urinary Incontinence among 836 Premenopausal Women, NIEHS Uterine Fibroid Study

	Total		SUI		Crude		Adjusted
Characteristic	n	%	n	%	PD (%)	95% CI	PD (%)	95% CI
UL presence
No	302	36.1	140	46.4	0		0
Yes	534	63.9	274	51.3	5.0	−2.1-12.0	7.4	0.4-14.3
UL size
No UL	302	36.1	140	46.4	0		0
<2 cm	143	17.1	68	47.6	1.2	−8.7-11.1	2.1	−7.5-11.7
2–4 cm	237	28.4	126	53.2	6.8	−1.7-15.2	9.6	1.3-17.9
≥4 cm	154	18.4	80	52.0	5.6	−4.1-15.2	9.3	−0.4-18.9
Anterior ULb ≥4 cm
No UL	302	37.4	140	46.4	0		0
Yes	35	4.3	17	48.6	2.2	−14.8-19.4	4.3	−11.9-20.6
Other UL	470	58.2	241	51.3	4.9	−2.3-12.1	7.4	0.2-14.4
Missing	29
Anterior ULb ≥2 cm
No UL	302	37.4	140	46.4	0		0
Yes	125	15.5	66	52.8	6.4	−4.0-16.8	9.8	−0.3-19.7
Other UL	380	47.1	192	50.5	4.2	−3.4-11.7	6.2	−1.3-13.7
Missing	29
Uterine sizec
Small	258	32.9	120	46.5	0		0
Medium	260	33.2	120	46.2	0.4	−8.9-8.2	−3.8	−12.3-4.7
Large	132	16.8	66	50.0	3.5	−7.0-13.9	1.1	−9.7-11.8
Very large	134	17.1	76	56.7	10.2	−0.2-20.4	8.7	−1.9-19.0
Missing	52

^aEstimated using linear risk models, adjusted for age at reference date, ethnicity, BMI, and number of deliveries.

^bAnterior UL, UL located in the anterior wall of a nonretroverted uterus.

^cSmall (≤91.4 cm³), medium (>91.4 cm³ and ≤148.9 cm³), large (>148.9 cm³ and ≤213.0 cm³), and very large (>213.0 cm³).

UL, uterine leiomyomata.