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Table 2 Population at-risk and incident cases of children who received academic support services across time by exposure to benzene, toluene, ethyl benzene and xylene pollutants, New York City Longitudinal Study of Early Development 1994–1998

From: Early-life exposure to air pollution and greater use of academic support services in childhood: a population-based cohort study of urban children

   Full Population Population with BTEX greater than 90th centile for at least one pollutant Population with BTEX lower than 90th centile for all pollutants Population with BTEX greater than 90th centile for all pollutants Population with BTEX lower than 90th centile for at least one pollutant
Time Point Population at-Risk Children receiving academic support services for the first time Children receiving academic support services for the first time Children receiving academic support services for the first time Children receiving academic support services for the first time Children receiving academic support services for the first time
Less than 12 months of age 201559 1004 121 883 77 927
12 months–24 months of age 200555 2599 339 2260 200 2399
24 months–36 months of age 197956 7962 1128 6834 673 7289
Pre-School Special Education 189994 5445 801 4644 460 4985
Kindergarten Special Education 184549 2987 388 2599 208 2779
3rd grade Special Education 181562 16881 2434 14447 1432 15449