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Table 2 Spearman’s rank correlation analysis among various indicators 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 CH PM2.5 PM10 AQI PCGRP Pb Hg As
CH 1.000 0.350a 0.047 0.201 0.434* 0.156 −0.084 0.058
PM2.5   1.000 0.724* 0.904* 0.240 −0.096 − 0.196 − 0.168
PM10    1.000 0.931* 0.111 −0.049 0.054 −0.035
AQI     1.000 0.186 −0.074 − 0.056 −0.099
PCGRP     1.000 −0.291 −0.381* − 0.342
Pb       1.000 0.803* 0.924*
Hg        1.000 0.805*
As         1.000
  1. PCGRP Per capital gross regional product
  2. * p<0.05
  3. a p = 0.058