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Table 2 Participant health behaviours stratified by pregnancy intention

From: Health behaviours in 131,182 UK women planning pregnancy

   Percentage of women (95% CI)   
Number of women Non-active planners
(n = 46,111)
Active planners
(n = 85,040)
Unadjusted OR
(95% CI)
Adjusted OR
(95% CI)a
Age (n = 127,101)
 18–24 47,977 50.4% (49.9–50.8) 30.7% (30.4–31.0) 1.00 (ref) 1.00 (ref)
 25–34 64,683 43.8% (43.3–44.2) 54.8% (54.5–55.2) 2.06 (2.01–2.11) 1.82 (1.76–1.88)
 35–40 12,905 5.3% (5.1–5.6) 12.8% (12.6–13.1) 3.94 (3.76–4.13) 3.40 (3.19–3.62)
 41 +  1536 0.5% (0.4–0.6) 1.6% (1.5–1.7) 5.29 (4.59–6.10) 4.60 (3.84–5.50)
 Question not answered 4081 - - - -
BMI (n = 111,031)
 18.5–24.9 (Recommended) 46,739 45.6% (45.1–46.1) 40.2% (39.8–40.5) 1.00 (ref) 1.00 (ref)
  < 18.5 (Underweight) 3826 3.8% (3.6–4.0) 3.2% (3.1–3.4) 0.96 (0.90–1.02) 1.05 (0.97–1.13)
 25–29 (Overweight) 28,559 25.5% (25.1–25.9) 25.8% (25.5–26.2) 1.15 (1.12–1.19) 1.12 (1.08–1.16)
 30 + (Obese) 31,907 25.1% (24.7–25.5) 30.8% (30.4–31.1) 1.39 (1.35–1.44) 1.48 (1.42–1.55)
 Question not answered/BMI excluded 20,151 - - - -
Smoking (n = 127,056)
 No 101,611 83.0% (82.7–83.3) 78.3% (78.0–78.6) 1.00 (ref) 1.00 (ref)
 Yes 25,445 17.0% (16.7–17.3) 21.7% (21.4–22.0) 1.35 (1.31–1.39) 1.87 (1.79–1.94)
 Question not answered 4126 - - - -
Illicit or recreational drug use (n = 126,985)
 No 122,287 96.0% (95.8–96.1) 96.5% (96.4–96.6) 1.00 (ref) 1.00 (ref)
 Yes 4698 4.0% (3.9–4.2) 3.5% (3.4–3.6) 0.86 (0.81–0.92) 0.99 (0.92–1.08)
 Question not answered 4166 - - - -
Alcohol consumption (n = 126,966)
 No 57,771 35.8% (35.3–36.2) 50.9% (50.5–51.2) 1.00 (ref) 1.00 (ref)
 Yes 69,195 64.2% (63.8–64.7) 49.1% (48.8–49.5) 0.54 (0.53–0.55) 0.58 (0.56–0.60)
 Question not answered 4185 - - - -
Caffeine consumption (n = 126,820)
 No 25,919 19.1% (18.7–19.5) 21.2% (20.9–21.5) 1.00 (ref) 1.00 (ref)
 Yes 100,901 80.9% (80.5–81.3) 78.8% (78.5–79.1) 0.88 (0.85–0.91) 1.00 (0.96–1.04)
 Question not answered 4331 - - - -
Weekly level of activity (n = 116,832)
 Less than 150 min of activity 49,071 40.9% (40.4–41.4) 42.6% (42.3–43.0) 1.00 (ref) 1.00 (ref)
 At least 150 min of moderate activity 50,813 44.4% (43.9–44.9) 43.0% (42.6–43.4) 0.93 (0.91–0.95) 0.91 (0.88–0.94)
 150 or more minutes of vigorous activity 16,948 14.7% (14.4–15.1) 14.4% (14.1–14.6) 0.94 (0.90–0.97) 0.94 (0.90–0.98)
 Question not answered 14,319 - - - -
Daily consumption of five portions of fruit and vegetables (n = 115,793)
 No 36,589 32.5% (32.0–32.9) 31.1% (30.8–31.4) 1.00 (ref) 1.00 (ref)
 Yes 61,747 52.0% (51.5–52.5) 54.1% (53.7–54.4) 1.09 (1.06–1.12) 0.92 (0.89–0.95)
 Don’t know 17,463 15.5% (15.2–15.9) 14.8% (14.6–15.1) 1.00 (0.96–1.04) 1.05 (1.00–1.10)
 Question not answered 15,352 - - - -
Folic acid supplementation (n = 99,362)
 No 68,033 90.8% (90.5–91.1) 56.0% (55.6–56.3) 1.00 (ref) 1.00 (ref)
 Yes 31,329 9.2% (8.9–9.5) 44.0% (43.7–44.4) 7.75 (7.45–8.06) 7.27 (6.97–7.59)
 Question not answered 31,789 - - - -
  1. a models adjusted for age, BMI, smoking, drug use, alcohol consumption, caffeine consumption, activity level, consumption of five-a-day & folic acid supplementation