Table 3.

95% Reference Ranges and Unadjusted Rate Ratios of Daytime and Nighttime Urination Frequencies by Demographic Characteristics and Fluid Intake in Healthy Women and Elite Healthy Women in the Boston Area Community Health Survey, 2008–2010

	Daytime Urination Frequency				Nighttime Urination Frequency
	Healthy Women (n = 1505)		Elite Healthy Women (n = 300)		Healthy Women (n = 1505)		Elite Healthy Women (n = 300)
	95% reference range	Unadjusted RR (95% CI)	95% reference range	Unadjusted RR (95% CI)	95% reference range	Unadjusted RR (95% CI)	95% reference range	Unadjusted RR (95% CI)
Age group
31–44	2–10	1.00 (-,-)	2–8	1.00 (-,-)	0–3	1.00 (-,-)	0–3	1.00 (-,-)
45–64	2–12	1.13 (1.07,1.18)	2–9	1.12 (0.91,1.38)	0–2	1.17 (0.89,1.55)	0–2	0.86 (0.57,1.29)
65+	2–9	0.95 (0.89,1.00)	2–8	0.91 (0.53,1.56)	0–2	1.39 (1.08,1.79)	0–2	1.57 (1.10,2.22)
Race/ethnicity
White	2–10	1.00 (-,-)	2–9	1.00 (-,-)	0–2	1.00 (-,-)	0–2	1.00 (-,-)
Black	2–10	0.93 (0.88,0.98)	2–8	0.92 (0.77,1.10)	0–3	1.51 (1.31,1.74)	0–3	1.61 (0.96,2.69)
Hispanic	2–10	0.92 (0.88,0.96)	2–10	0.92 (0.77,1.10)	0–3	1.48 (0.98,2.24)	0–3	1.28 (0.57,2.20)
Fluid intake
≤ 49 oz	2–10	0.93 (0.87,1.00)	2–7	0.77 (0.61,0.97)	0–2	0.87 (0.64,1.18)	0–2	0.78 (0.53,1.17)
50–74 oz	2–9	1.00 (-,-)	2–9	1.00 (-,-)	0–3	1.00 (-,-)	0–3	1.00 (-,-)
75+ oz	2–12	1.06 (1.00,1.13)	3–10	1.00 (0.79,1.27)	0–2	0.99 (0.77,1.27)	0–2	1.03 (0.54,1.95)
Time of most fluid intake
Before 5 p.m.						1.00 (-,-)		1.00 (-,-)
After 5 p.m.						1.08 (0.86,1.36)		0.62 (0.28,1.37)

Note. RR = rate ratio; CI = confidence interval.