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Table 1 Descriptive statistics of the study population

From: Does residential mobility during pregnancy induce exposure misclassification for air pollution?

Characteristics (N = 486) N %
Hospital/clinic
 Tenon 115 23.7
 Lariboisière 105 21.6
 Port-Royal 173 35.6
 Sainte-Félicité 80 16.5
 La Muette 13 2.7
 Education   
 Low (<Baccalaureat) 132 27.2
 Middle (= Baccalaureat level) 159 32.7
 High (> Baccalaureat) 195 40.1
Census block socioeconomic deprivation class
 (most privileged) 1 96 19.7
 2 96 19.7
 3 92 18.9
 4 111 22.8
(most deprived) 5 75 15.4
Missing value a 16 3.3
Occupational activity
 1st trimester (T1) 398 81.9
 2de trimester (T2) 300 61.7
 3rd trimester (T3) 112 23.0
Commuting modes
 By foot 49 10.1
 Bicycles / motorcycles 9 1.9
 Car 10 2.1
 Metro 320 65.9
 Bus 51 10.5
 Tramways 2 0.4
Missing valueb 45 9.3
 IRIS of residence (N = 992 IRIS) 345c 34.8c
IRIS of occupation (N = 992 IRIS)d
 1st trimester (T1) 283 28.5
 2de trimester (T2) 229 23.1
 3rd trimester (T3) 91 9.2
  1. aIt was not possible to geocode sixteen women due to incomplete postal address
  2. bMissing/no information regarding commuting mode
  3. cThe 486 women were distributed across 345 census blocks, representing 34.8% of the total number of census blocks in Paris (345/992)
  4. dNine women had the same residential and occupational census blocks (IRIS)