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Table 1 Characteristics of the cohort of 970 women and newborns, Logan, Queensland (June 2006 to December 2008)

From: Increased traffic exposure and negative birth outcomes: a prospective cohort in Australia

Discrete variables Number missing N (%)  
Mother's smoking during pregnancy = Yes 113 208 (24)  
Household smoking during pregnancy = Yes 110 312 (36)  
Mother's education = Primary 109 10 (1)  
   = High school - 414 (38)  
   = TAFE - 235 (27)  
   = Tertiary - 202 (24)  
Newborn gender = Male 0 460 (47)  
Continuous variables Number missing Mean (SD) Range
Mother's age (years) 11 28.2 (5.7) 15-47
Gestation (weeks) 0 39.6 (1.6) 31.4-42.1
Birth weight (grams) 0 3,453 (549) 1,154-6,000
Head circumference (cm) 32 34.7 (1.6) 29.0-40.0
Birth length (cm) 10 51.4 (2.9) 41.0-63.0
Traffic measures Number missing Median (IQR) Range
Distance to freeway (km) 0 1.9 (2.4) 0.06-33.3
Distance to highway (km) 0 6.5 (6.1) 0.01-20.2
Distance to main road (km) 0 0.6 (0.9) 0.01-7.9
Number of freeway segments within 500 metres 0 0 (0) 0-14
Number of highway segments within 500 metres 0 0 (0) 0-14
Number of main road segments within 500 metres 0 0 (5) 0-31
  1. TAFE = Technical and Further Education, SD = Standard deviation, IQR = Inter-quartile range