Table 3.

Odds Ratios for Body Mass Index, Drinking, and Smoking on Menstrual Cycle Irregularity Among Age Groups

Age (years)	Variables	Unadjusted, OR (95% CI)	Adjusted model 1, OR (95% CI)	Adjusted model 2, OR (95% CI)
19–29	Body mass index
	18.5–22.9	1.00	1.00	1.00
	<18.5	0.68 (0.37–1.23)	0.69 (0.38–1.25)	0.68 (0.37–1.24)
	23.0–24.9	1.16 (0.60–2.25)	1.23 (0.63–2.39)	1.29 (0.66–2.51)
	25.0–29.9	2.06 (1.10–3.84)	2.28 (1.20–4.31)	2.33 (1.24–4.37)
	≥30.0	2.98 (1.38–6.44)	2.66 (1.14–6.24)	2.89 (1.21–6.90)
	Lifetime alcohol drinking
	No	1.00	1.00	1.00
	Yes	0.74 (0.26–2.11)	0.71 (0.23–2.16)	0.75 (0.24–2.39)
	Lifetime smoking
	No	1.00	1.00	1.00
	Yes	1.53 (0.99–2.38)	1.63 (1.02–2.62)	1.57 (0.96–2.56)
30–39	Body mass index
	18.5–22.9	1.00	1.00	1.00
	<18.5	1.12 (0.49–2.54)	1.09 (0.48–2.48)	1.03 (0.45–2.35)
	23.0–24.9	1.68 (0.99–2.86)	1.71 (1.01–2.91)	1.71 (0.99–2.94)
	25.0–29.9	1.94 (1.12–3.36)	1.92 (1.10–3.34)	1.95 (1.12–3.41)
	≥30.0	2.11 (0.76–5.86)	2.16 (0.77–6.03)	2.32 (0.82–6.61)
	Lifetime alcohol drinking
	No	1.00	1.00	1.00
	Yes	1.45 (0.54–3.87)	1.10 (0.40–2.98)	1.07 (0.39–2.88)
	Lifetime smoking
	No	1.00	1.00	1.00
	Yes	1.94 (1.23–3.06)	1.69 (1.07–2.68)	1.58 (0.98–2.54)
40–49	Body mass index
	18.5–22.9	1.00	1.00	1.00
	<18.5	1.91 (0.91–5.14)	2.04 (0.73–5.65)	2.13 (0.80–5.68)
	23.0–24.9	1.05 (0.59–1.89)	0.99 (0.54–1.81)	0.98 (0.53–1.81)
	25.0–29.9	1.53 (0.90–2.58)	1.50 (0.88–2.56)	1.54 (0.91–2.61)
	≥30.0	0.83 (0.20–3.44)	0.78 (0.20–3.05)	0.76 (0.20–2.83)
	Lifetime alcohol drinking
	No	1.00	1.00	1.00
	Yes	1.09 (0.50–2.35)	1.09 (0.49–2.44)	1.05 (0.47–2.33)
	Lifetime smoking
	No	1.00	1.00	1.00
	Yes	0.74 (0.36–1.50)	0.76 (0.37–1.57)	0.77(0.36–1.64)

Adjusted model 1: Adjusted for age, body mass index, alcohol drinking experience, and smoking.

Adjusted model 2: Adjusted for age, body mass index, alcohol drinking experience, smoking, marital status, and age at menarche.