Risk factor | n | % | Unadjusted analysis | Adjusted analysis * | |||
---|---|---|---|---|---|---|---|
n = 20,135 | n = 19,316 | ||||||
OR | [95% CI] | OR | [95% CI] | ||||
Self-Defined Ethnicity | British (White) | 3,875 | 19.25 | 1.00 | 1.00 | ||
African (except Somali) | 2,715 | 13.48 | 2.03 | [1.83, 2.25] | 1.56 | [1.38, 1.77] | |
Somali | 480 | 2.38 | 3.11 | [2.56, 3.77] | 1.58 | [1.28, 1.96] | |
Caribbean | 591 | 2.94 | 1.44 | [1.20, 1.73] | 1.33 | [1.09, 1.61] | |
Eastern European | 2,531 | 12.57 | 1.90 | [1.71, 2.11] | 1.49 | [1.32, 1.69] | |
Other White | 395 | 1.96 | 1.34 | [1.08, 1.67] | 1.04 | [0.82, 1.32] | |
Bangladeshi (inc British) | 2,867 | 14.24 | 1.55 | [1.40, 1.72] | 1.20 | [1.07, 1.34] | |
Indian (inc British) | 1,842 | 9.15 | 1.34 | [1.19, 1.51] | 1.11 | [0.97, 1.26] | |
Pakistani (inc. British) | 3,109 | 15.44 | 1.35 | [1.22, 1.50] | 1.16 | [1.04, 1.29] | |
Other Asian | 957 | 4.75 | 1.58 | [1.37, 1.83] | 1.16 | [0.97, 1.40] | |
Other | 685 | 3.4 | 1.64 | [1.38, 1.94] | 1.16 | [0.98, 1.36] | |
Missing values | 88 | 0.44 | |||||
Age at booking (years) | <20 | 980 | 4.87 | 1.37 | [1.20, 1.58] | 1.32 | [1.13, 1.54] |
20-24 | 4,578 | 22.74 | 1.00 | 1.00 | |||
25-29 | 7,137 | 35.45 | 0.73 | [0.67, 0.79] | 0.75 | [0.69, 0.82] | |
30-34 | 4,811 | 23.89 | 0.71 | [0.65, 0.77] | 0.72 | [0.65, 0.79] | |
35-39 | 2,070 | 10.28 | 0.75 | [0.68, 0.84] | 0.68 | [0.60, 0.78] | |
≥40 | 551 | 2.74 | 0.83 | [0.69, 0.99] | 0.71 | [0.58, 0.88] | |
Missing values | 8 | 0.04 | |||||
Parity | No previous live births | 9,815 | 48.75 | 1.10 | [1.02, 1.18] | 0.99 | [0.92, 1.07] |
1 previous live birth | 5,517 | 27.4 | 1.00 | 1.00 | |||
2 previous live births | 2,763 | 13.72 | 1.14 | [1.04, 1.25] | 1.17 | [1.06, 1.30] | |
3 previous live births | 1,167 | 5.8 | 1.34 | [1.18, 1.52] | 1.43 | [1.24, 1.64] | |
4+ previous live births | 854 | 4.24 | 2.06 | [1.78, 2.39] | 2.09 | [1.77, 2.46] | |
Missing values | 19 | 0.09 | |||||
Woman’s occupation | Managerial/professional | 2,444 | 12.14 | 1.00 | 1.00 | ||
Lower supervisory/technical | 2,492 | 12 | 1.12 | [0.99, 1.27] | 1.01 | [0.88, 1.15] | |
Semi-routine & routine | 3,319 | 16.48 | 1.59 | [1.42, 1.79] | 1.15 | [1.02, 1.31] | |
Self-employed | 177 | 0.88 | 2.22 | [1.63, 3.02] | 1.52 | [1.09, 2.11] | |
Housewife | 6,968 | 34.61 | 1.85 | [1.67, 2.05] | 1.25 | [1.11, 1.41] | |
Unclassifiable | 4,735 | 23.52 | 2.34 | [2.10, 2.60] | 1.59 | [1.42, 1.80] | |
Missing values | 0 | 0 | |||||
Language ability | English speaker | 13,466 | 66.88 | 1.00 | 1.00 | ||
Non-English speaker | 6,539 | 32.48 | 1.51 | [1.42, 1.60] | 1.39 | [1.29, 1.50] | |
Missing values | 130 | 0.65 | |||||
Birthplace | Born in the UK | 4,464 | 22.17 | 1.00 | 1.00 | ||
Born outside the UK | 15,666 | 77.8 | 1.52 | [1.41, 1.63] | 1.33 | [1.21, 1.46] | |
Missing values | 5 | 0.02 | |||||
Housing status | Owner-occupier | 3,752 | 18.63 | 1.00 | 1.00 | ||
Rented | 14,060 | 69.83 | 1.65 | [1.52, 1.78] | 1.36 | [1.25, 1.48] | |
Temporary accommodation | 344 | 1.71 | 2.54 | [2.03, 3.18] | 1.71 | [1.35, 2.16] | |
Other | 1,281 | 6.36 | 2.51 | [2.20, 2.86] | 1.94 | [1.68, 2.22] | |
Missing values | 698 | 3.47 | |||||
Year of Booking | 2008 | 6,476 | 32.16 | 1.00 | 1.00 | ||
2009 | 6,450 | 32.03 | 0.60 | [0.56, 0.65] | 0.62 | [0.57, 0.66] | |
2010 | 6,775 | 33.65 | 0.45 | [0.42, 0.49] | 0.48 | [0.44, 0.52] | |
2011 | 434 | 2.16 | 0.50 | [0.41, 0.62] | 0.53 | [0.44, 0.66] | |
Missing values | 0 | 0 |