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Table 1 Demographic characteristics

From: Tap water use amongst pregnant women in a multi-ethnic cohort

   Nested subset Main cohort
Characteristics   n % n %
All   39 100.0 4070 100.0
Age <20 2 5.1 302 7.4
  20-24 4 10.3 1088 26.7
  25-29 13 33.3 1317 32.4
  30-34 15 38.5 839 20.6
  35-39 4 10.3 450 11.1
  ≥40 1 2.6 73 1.8
  Missing data    1 0.02
Marital Status Married 31 79.5 2864 70.4
  Single 8 20.5 1198 29.4
  Missing data    8 0.2
Highest Educational Qualification None 4 10.3 698 17.1
  O level/GCSE or A level 13 33.3 1389 34.1
  Degree 14 35.9 827 20.3
  Other (e.g. NVQ) 8 20.5 1094 26.9
  Don't know    53 1.3
  Missing data    9 0.2
Employment status Employed 20 51.3 1624 39.9
  Unemployed 18 46.2 2258 55.5
  Maternity/Sick leave 1 2.6 184 4.5
  Missing data    4 0.1
Parity 0 14 35.9 1587 39.0
  1 15 38.5 1198 29.4
  2 7 17.9 657 16.1
  3+ 3 7.7 528 13.0
  Missing data    100 2.5
Household Income <£20,000 15 38.5 1876 46.1
  £20,000-40,000 14 35.9 953 23.4
  >£40,000 7 17.9 332 8.2
  Don't know 3 7.7 846 20.8
  Not stated/missing    63 1.4
Ethnicity White British 19 48.7 1573 38.6
  White Other 1 2.6 96 2.4
  Pakistani 15 38.5 1873 46.0
  Indian 1 2.6 159 3.9
  Bangladeshi 0 0.0 94 2.3
  Any other Asian origin 0 0.0 40 1.0
  Black or Black British 1 2.6 105 2.6
  Mixed 0 0.0 67 1.6
  All Other 2 5.1 59 1.4
  Not stated/missing    4 0.1
Smoking Current smoker 4 10.3 562 13.8
  Past smoker 8 20.5 612 15.0
  Never smoker 27 69.2 2896 71.2