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Table 1 Summary statistics of CH and other pollutant indices in China

From: Maternal exposure to PM2.5 may increase the risk of congenital hypothyroidism in the offspring: a national database based study in China

Indicators a Mean SD P25 P50 P75
CH 4.049 4.570 2.818 3.615 5.038
PM2.5 58.131 16.842 48.142 57.458 67.688
PM10 100.611 27.491 81.083 102.292 116.938
AQI 88.958 20.746 77.023 89.015 103.312
Per capital GRP 51.458 22.089 35.113 41.221 63.904
Pb 2439.287 4218.210 129.150 784.650 3890.950
Hg 24.870 34.464 5.025 10.550 30.575
As 3484.770 7180.292 70.825 872.800 3387.625
  1. SD: standard deviation; P25, P50, P75: 25th, 50th, 75th percentile
  2. a The unit of measurement for each indicator: per 10,000 for CH; μg/m3 for PM2.5 and PM10; thousand yuan for per capital GRP; million tons for Pb, Hg and As