Skip to main content

Table 1 Description of the sample; unadjusted and adjusted odds ratios for the effect of each risk factor on late antenatal booking

From: Predictors of the timing of initiation of antenatal care in an ethnically diverse urban cohort in the UK

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     
  1. OR, Odds ratio; CI, Confidence interval.
  2. * Each variable adjusted for all other variables in the model.