Table 2

Adverse perinatal outcomes among all women with singleton births (n=1 164 953) according to socioeconomic status (SES) and smoking status groups in 1991–2010 in Finland

Characteristic, %Non-smokingQuit smokingSmokingNo information on smoking
Admission to a neonatal unit
 Upper white-collar worker7.910.38.38.4
 Lower white-collar worker8.310.49.18.7
 Blue-collar worker8.910.49.910.5
 Other*8.19.310.58.8
 Missing8.410.411.07.2
Stillbirth
 Upper white-collar worker0.70.40.50.7
 Lower white-collar worker0.80.50.81.0
 Blue-collar worker0.90.80.91.1
 Other*0.80.40.81.0
 Missing0.70.50.60.6
Prematurity (<37 weeks)
 Upper white-collar worker4.13.74.55.7
 Lower white-collar worker4.34.45.56.6
 Blue-collar worker4.54.95.77.7
 Other*4.23.96.07.4
 Missing4.65.06.112.4
LBW (<2500 g)
 Upper white-collar worker2.72.24.74.1
 Lower white-collar worker2.83.05.24.8
 Blue-collar worker3.03.65.65.9
 Other*2.83.05.45.4
 Missing3.13.85.410.8
SGA (<−2SD)
 Upper white-collar worker2.82.96.42.9
 Lower white-collar worker2.93.86.73.7
 Blue-collar worker3.14.17.14.4
 Other*3.13.76.73.9
 Missing3.34.67.35.8
Major congenital anomaly
 Upper white-collar worker3.23.13.63.5
 Lower white-collar worker3.23.83.23.7
 Blue-collar worker3.23.73.53.8
 Other*3.33.83.74.0
 Missing3.64.44.04.3
  • *The ‘other’ group included entrepreneurs, students, retired, unemployed, housewives and unclassifiable cases.

  • LBW, low birth weight; SGA, small for gestational age.