Table 1

Asturias INfancia y Medio Ambiente (INMA) cohort characteristics and estimated pollution levels

 NO2Benzene
NMeanSDMinimumMaximump Value*NMeanSDMinimumMaximump Value*
Residential zone
 Town centre35625.015.408.3039.06<0.0013562.431.290.347.91<0.001
 Residential zone3518.917.108.0830.52352.131.360.475.58
 Countryside3914.946.617.5635.82391.341.080.044.26
Residential building age
 <59422.146.179.0938.270.001942.651.530.516.760.109
 5–146722.677.149.5637.89672.441.410.045.76
 15–296624.795.758.3039.06662.201.240.347.91
 >2916024.686.037.5637.301602.131.110.195.97
Missings4343
Participant's age
 <252121.487.548.3032.950.503211.841.210.345.760.055
 25–2911723.616.208.6836.881172.101.120.455.80
 30–3418323.986.458.3038.271832.371.360.056.76
 35+10923.366.687.5639.061092.511.420.047.91
Country of birth
 Spain41323.576.427.5639.060.4094132.311.330.047.910.893
 Other1724.428.378.0836.88172.180.890.974.83
Education
 Primary8023.296.248.3034.580.793802.261.210.345.760.117
 Secondary19423.496.887.5638.271942.191.310.197.91
 University15623.906.168.0839.061562.471.360.046.76
Social class (SC, mother)
 SCI+II9223.966.188.0539.060.949922.451.280.455.320.026
 SCIII9023.027.267.5634.50902.061.380.047.91
 SCIV+V24723.676.348.3038.272472.331.300.196.76
 Missings11
Working status (third term)
 Yes10624.436.188.6837.890.1321062.431.250.045.970.126
 No29823.336.597.5639.062982.271.330.057.91
 Missings2626
Parity
 Primiparous26223.836.358.0539.060.5242622.361.290.346.760.175
 Multiparous16823.246.737.5637.781682.221.360.047.91
Smoking
 Never smoking20423.096.547.5638.270.1962042.301.280.045.970.022
 No smoking during pregnancy12924.675.9410.2439.061292.471.400.057.91
 Smoking but not after 12th week227.130.3726.8727.3924.180.184.054.31
 Smoking after 12th week6923.127.238.3037.78691.981.150.345.76
 Missings2626
Season of last menstruation
 Winter12222.726.048.3036.880.0141222.271.310.385.800.108
 Spring9524.046.898.5239.06952.551.390.196.76
 Summer9324.996.368.4637.78932.111.310.057.91
 Autumn12023.076.617.5638.271202.301.250.045.97
  • *Kruskal-Wallis or Mann-Whitney test.