TABLE 2

Maternal Characteristics According to Smoking and NRT Exposure in Early Pregnancy

CharacteristicNRT Group
(n = 2677)Smokers
(n = 9980)Control Group
(n = 179 841)
n%n%n%
Age at conception, y
 15–191746.5124012.421011.2
 20–2463023.5284928.514 4908.1
 25–2977228.8263226.447 63426.5
 30–3464424.1200420.1%67 35237.5
 35–3937013.8100610.139 61222.0
 40–44843.12402.482434.6
 45–4930.190.14090.2
Townsend deprivation index score
 Quintile 1 (most affluent)2439.1103610.448 33126.9
 Quintile 236713.7124712.536 82520.5
 Quintile 356421.1196419.734 88419.4
 Quintile 471126.6256225.728 39215.8
 Quintile 5 (most deprived)61022.8252725.318 09010.1
 Missing1826.86446.513 3197.4
Preconception BMI
 Normal (18.5–24.9)78029.1294929.559 06632.8
 Underweight (<18.5)863.23263.334241.9
 Overweight (25–29.9)46617.4151515.228 90716.1
 Obese (≥30)38514.4123012.319 79111.0
 Missing96035.9396039.768 65338.2
Asthma38914.5104110.414 7838.2
Hypertension632.41831.855923.1
Diabetes913.42152.257823.2
Mental illness55520.7152515.312 4796.9
Epilepsy110.4680.77330.4