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Table 5 Participant health behaviours stratified by duration of pregnancy planning

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

   Percentage of active planners (95% CI)   
  Number of active planners Stopped contraception < 1 year ago
(n = 42,961)
Stopped contraception > 1 year ago
(n = 39,912)
Unadjusted OR (95% CI) Adjusted ORa (95% CI)
Age (n = 81,533)
 18–24 25,038 33.2% (32.7–33.6) 28.0% (27.6–28.5) 1.00 (ref) 1.00 (ref)
 25–34 44,732 55.9% (55.4–56.4) 53.8% (53.3–54.3) 1.14 (1.10–1.18) 1.27 (1.22–1.32)
 35–40 10,456 9.9% (9.6–10.2) 16.0% (15.6–16.4) 1.91 (1.83–2.00) 2.17 (2.05–2.30)
 41 +  1307 1.0% (0.9–1.1) 2.2% (2.1–2.4) 2.53 (2.25–2.85) 2.88 (2.52–3.29)
 Question not answered 1340 - - - -
BMI (n = 71,373)
 18.5–24.9 (Recommended) 28,662 42.4% (41.9–42.9) 37.7% (37.2–38.3) 1.00 (ref) 1.00 (ref)
  < 18.5 (Underweight) 2304 3.1% (2.9–3.3) 3.4% (3.2–3.5) 1.21 (1.11–1.32) 1.19 (1.09–1.29)
 25–29 (Overweight) 18,443 26.6% (26.1–27.0) 25.0% (24.6–25.5) 1.06 (1.02–1.10) 1.04 (1.00–1.08)
 30 + (Obese) 21,964 27.9 (27.5–28.4) 33.9% (33.4–34.4) 1.36 (1.32–1.41) 1.30 (1.24–1.36)
 Question not answered/BMI excluded 11,500 - - - -
Smoking (n = 81,737)
 No 64,014 80.3% (79.9–80.6) 76.2% (75.8–76.6) 1.00 (ref) 1.00 (ref)
 Yes 17,723 19.7% (19.4–20.1) 23.8% (23.4–24.2) 1.27 (1.23–1.31) 1.25 (1.20–1.31)
 Question not answered 1136 - - - -
Illicit or recreational drug use (n = 81,678)
 No 78,813 96.8% (96.6–96.9) 96.2% (96.0–96.4) 1.00 (ref) 1.00 (ref)
 Yes 2865 3.2% (3.1–3.4) 3.8% (3.6–4.0) 1.18 (1.09–1.27) 1.17 (1.07–1.28)
 Question not answered 1195 - - - -
Alcohol consumption (n = 81,659)
 No 41,532 47.5% (47.1–48.0) 54.4% (53.9–54.9) 1.00 (ref) 1.00 (ref)
 Yes 40,127 52.5% (52.0–52.9) 45.6% (45.1–46.1) 0.76 (0.74–0.78) 0.74 (0.72–0.77)
 Question not answered 1214 - - - -
Caffeine consumption (n = 81,568)
 No 17,278 20.4% (20.0–20.8) 22.0% (21.6–22.4) 1.00 (ref) 1.00 (ref)
 Yes 64,290 79.6% (79.2–80.0) 78.0% (77.6–78.4) 0.91 (0.88–0.94) 0.94 (0.90–0.98)
 Question not answered 1305 - - - -
Weekly level of activity (n = 75,076)
 Less than 150 min of activity 32,002 42.9% (42.4–43.3) 42.4% (41.9–42.9) 1.00 (ref) 1.00 (ref)
 At least 150 min of moderate activity 32,291 43.1% (42.6–43.6) 43.0% (42.4–43.5) 1.01 (0.98–1.04) 1.03 (1.00–1.07)
 150 or more minutes of vigorous activity 10,783 14.1% (13.7–14.4) 14.7% (14.3–15.0) 1.05 (1.01–1.10) 1.08 (1.02–1.13)
 Question not answered 7797 - - - -
Daily consumption of five portions of fruit and vegetables (n = 74,403)
 No 23,144 30.7% (30.2–31.1) 31.6% (31.1–32.1) 1.00 (ref) 1.00 (ref)
 Yes 40,216 54.8% (54.3–55.3) 53.2% (32.7–53.7) 0.94 (0.91–0.97) 0.93 (0.90–0.97)
 Don’t know 11,043 14.5% (14.2–14.9) 15.2% (14.8–15.6) 1.02 (0.97–1.06) 1.03 (0.98–1.09)
 Question not answered 8470 - - - -
Folic acid supplementation (n = 63,541)
 No 35,561 54.9% (54.4–55.5) 57.1% (56.5–57.7) 1.00 (ref) 1.00 (ref)
 Yes 27,980 45.1% (44.5–45.6) 42.9% (42.3–43.5) 0.92 (0.89–0.95) 0.88 (0.85–0.91)
 Question not answered 19,332 - - - -
  1. a models adjusted for age, BMI, smoking, drug use, alcohol consumption, caffeine consumption, activity level, consumption of five-a-day & folic acid supplementation