Table 1

Baseline characteristics by exposure group

CharacteristicOnline contraception (SH:24) (n=204)Other services (n=181)NP value (χ2)
%95% CI
Age group (years)
 16–196.4(3.4–10.1)20.4(14.8 to 27.1)50<0.001*
 20–2436.8 (30.1–43.8)38.7(31.5 to 46.2)145
 25–2941.7 (34.8–48.8)24.3(18.3 to 31.2)129
 30+15.2 (10.6–20.9)16.6(11.5 to 22.8)61
Ethnic group
 White50.5 (43.4–58.9)39.8(32.6 to 47.3)1750.151
 Black12.3 (8.1–17.6)18.2(12.9 to 24.6)58
 Asian5.9 (3.1–10.0)6.1(3.1 to 10.6)23
 Mixed6.4 (3.4–10.7)8.8(5.1 to 14.0)29
 Other2.0 (0.1–4.9)5.0(2.3 to 9.2)13
 Missing23.0 (17.4–29.4)22.1(16.3 to 28.9)87
IMD
 First quintile (most deprived)35.3 (28.7–42.3)34.8(27.9 to 42.2)1350.211
 Second quintile37.3 (30.6–44.3)44.8(37.4 to 52.3)157
 Third quintile22.1 (16.6–28.4)13.3(8.7 to 19.0)69
 Fourth quintile4.9 (2.4–8.8)5.5(2.7 to 9.9)20
 Fifth quintile (least deprived)0.5 (0.0–2.7)1.1(0.1 to 3.9)3
 Missing0.0 (0.0–1.8)0.6(0.0 to 3.0)1
Education
 Entry level – Level 22.9 (1.1–6.3)6.1(3.1 to 10.6)170.166
 Level 3–515.2 (10.6–20.9)21.0(15.3 to 27.7)69
 Level 6–858.8 (51.7–65.6)50.8(43.3 to 58.3)212
 Missing23.0 (17.4–29.4)22.1(16.3 to 28.9)87
Employment
 Employed46.6 (40.0–53.7)40.3(33.1 to 47.9)1680.545
 Studentand employed3.9 (1.7–7.6)3.3(1.2 to 7.1)14
 Student20.1 (14.8–26.3)27.1(20.7 to 34.2)90
 Unemployed6.4 (3.4–10.7)7.2(3.9 to 12.0)26
 Missing23.0 (17.4–29.4)22.1(16.3 to 28.9)87
Smoker
 Yes9.8 (6.1–14.7)24.9(18.7 to 31.8)65<0.001*
 No67.2 (60.3–73.6)53.0(45.5 to 60.5)233
 Missing23.0 (17.4–29.4)22.1(16.3 to 28.9)87
Previous OC use
 No previous OC use11.3 (7.3–16.4)21.0(15.3 to 27.7)610.003*
 Previous OC use in past year48.0 (41.0–55.1)32.0(25.3 to 39.4)156
 Previous OC use more than a year ago17.2 (12.3–23.0)24.3(18.3 to 31.2)79
 Missing23.5 (17.9–30.0)22.7(16.8 to 29.4)89
Reason for OC use
 Pregnancy prevention64.7 (57.7–71.3)68.0(60.6 to 74.7)2550.708
 Other11.8 (7.7–17.0)9.4(5.6 to 14.6)41
 Missing23.5 (17.9–30.0)22.7(16.8 to 29.4)89
Sexually active
 Yes72.1 (65.4–78.1)71.8(64.7 to 78.2)2770.872
 No4.4 (2.0–8.2)5.5(2.7 to 9.9)19
 Missing23.5 (17.9–30.0)22.7(16.8 to 29.4)89
Sexual partners in past year
 03.9 (1.7–7.6)1.7(0.3 to 4.8)110.606
 132.4 (26.0–39.2)34.3(27.4 to 41.7)128
 2+40.2 (33.4–47.3)40.9(33.6 to 48.4)156
 Missing23.5 (17.9–30.0)23.2(17.3 to 30.0)90
Regular sexual partner
 Yes54.9 (22.8–35.7)56.4(48.8 to 63.7)1540.952
 No21.6 (41.0–55.1)20.4(14.8 to 27.1)141
 Missing23.5 (17.4–29.4)23.2(17.3 to 30.0)90
Previous pregnancies
 061.8 (54.7–68.5)54.1(46.6 to 61.2)2240.196
 17.8 (4.5–12.4)11.6(7.3 to 17.2)37
 2+5.9 (3.1–10.0)8.8(5.1 to 14.0)28
 Prefer not to say1.0 (0.1–3.5)2.2(0.6 to 5.6)6
 Missing23.5 (17.9–30.0)23.2(17.3 to 30.0)90
Children
 070.6 (63.8–76.7)65.2(57.8 to 72.1)2620.390
 12.5 (0.8–5.6)5.0(2.3 to 9.2)14
 2+2.5 (0.8–5.6)4.4(1.9 to 8.5)13
 Prefer not to say1.0 (0.1–3.5)2.2(0.6 to 5.6)6
 Missing23.5 (17.9–30.0)23.2(17.3 to 30.0)90
Abortions
 064.2 (57.2–70.8)59.7(52.1 to 66.9)2390.654
 18.3 (4.9–13.0)10.5(6.4 to 15.9)36
 2+2.5 (0.8–5.6)3.3(1.2 to 7.1)11
 Prefer not to say1.5 (0.3–4.2)3.3(1.2 to 7.1)9
 Missing23.5 (17.9–30.0)23.2(17.3 to 30.0)90
UPSI in past year
 Yes37.3 (30.6–44.3)43.7(36.3 to 51.2)1550.330
 No37.3 (30.6–44.3)30.4(23.8 to 37.6)131
 Unsure2.0 (0.5–4.9)1.7(0.3 to 4.8)7
 Prefer not to say0.0 (0.0–1.8)1.1(0.1 to 3.9)2
 Missing23.5 (17.9–30.0)23.2(17.3 to 30.0)90
Taken EC in past year
 Yes24.0 (18.3–30.5)42.5(35.2 to 50.1)126<0.001*
 No52.5 (45.4–59.5)32.6(25.8 to 39.9)166
 Unsure0.0 (0.00–1.8)1.1(0.1 to 3.9)2
 Prefer not to say0.0 (0.00–1.8)0.6(0.0 to 3.0)1
 Missing23.5 (17.9–30.0)23.2(17.3 to 30.0)90
Likelihood that OCs prescribed will be taken
 Unlikely0.5 (0.0–2.7)7.2(3.9 to 12.0)14<0.001*
 Neutral2.0 (0.5–4.9)6.6(3.5 to 11.3)16
 Likely74.0 (67.4–80.0)63.0(55.5 to 70.0)265
 Missing23.5 (17.9–30.0)23.2(17.3 to 30.0)90
Likelihood of pregnancy while on OCs
 Unlikely70.1 (63.3–76.3)65.8(58.3 to 72.6)2620.362
 Neutral4.4 (2.0–8.2)8.8(5.1 to 14.0)25
 Likely2.0 (0.5–4.9)2.2(0.6 to 5.6)8
 Missing23.5 (17.9–30.0)23.2(17.3 to 30.0)90
Feelings of others† towards OC use
 Negative5.9 (3.1–10.0)10.5(6.4 to 15.9)310.408
 Neutral21.1 (15.7–27.3)21.0(15.3 to 27.7)81
 Positive49.5 (42.5–56.6)45.3(37.9 to 52.9)183
 Missing23.5 (17.9–30.0)23.2(17.3 to 30.0)90
Feelings towards pregnancy
 Negative44.1 (37.2–51.2)44.2(36.8 to 51.8)1700.056
 Neutral26.0 (20.1–32.6)18.8(13.4 to 25.2)87
 Positive6.4 (3.4–10.7)13.8(9.1 to 19.7)38
 Missing23.5 (17.9–30.0)23.2(17.3 to 30.0)90
  • †Worded in the questionnare as "the people who are most important to you".

  • *Denotes statistical significance.

  • CI, confidence interval; EC, emergency contraception; IMD, Index of Multiple Deprivation; OC, oral contraceptive; UPSI, unprotected sexual intercourse.