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Table 2 Association of maternal mercury levels with child risk of overweight or obesity

From: In utero exposure to mercury and childhood overweight or obesity: counteracting effect of maternal folate status

Age groupMercury quartile  CrudeAdjusted
nCase, n(%)RR95% CIpRR95% CIp
Total sample 2–15 years (n = 1442)
 Q1360138 (38·3)1·00  1·00  
 Q2361154 (42·7)1·110·93–1·330·2381·090·92–1·300·313
 Q3359146 (40·7)1·060·89–1·270·5221·030·86–1·230·748
 Q4362174 (48·1)1·251·06–1·490·0091·241·05–1·470·013
P trend    0·047  0·098
 Q1–Q31080438 (40·6)1·00  1·00  
 Q4362174 (48·1)1·191·04–1·350·0101·191·05–1·350·007
2–5 years (n = 1395)
 Q1346113 (32·7)1·00  1·00  
 Q2347139 (40·1)1·231·01–1·500·0441·200·99–1·450·061
 Q3347138 (39·8)1·221·00–1·490·0531·150·95–1·410·160
 Q4355159 (44·8)1·371·13–1·660·0011·331·10–1·610·003
P trend    0·015  0·067
 Q1–Q31040390 (37·5)1·00  1·00  
 Q4355159 (44·8)1·191·04–1·370·0131·191·03–1·360·016
6–9 years (n = 1030)
 Q1250100 (40·0)1·00  1·00  
 Q2255118 (46·3)1·160·95–1·410·1561·150·94–1·390·171
 Q3258116 (45·0)1·120·92–1·380·2591·090·89–1·340·399
 Q4267142 (53·2)1·331·10–1·610·0031·301·07–1·580·007
P trend    0·028  0·100
 Q1–Q3763334 (43·8)1·00  1·00  
 Q4267142 (53·2)1·211·06–1·400·0061·201·04–1·380·010
10–15 years (n = 449)
 Q19138 (41·8)1·00  1·00  
 Q210647 (44·3)1·060·77–1·470·7161·140·84–1·560·383
 Q313867 (48·6)1·160·86–1·570·3201·220·91–1·640·184
 Q411462 (54·4)1·300·97–1·750·0791·401·04–1·880·028
P trend    0·057  0·058
 Q1–Q3335152 (45·4)1·00  1·00  
 Q411462 (54·4)1·200·98–1·470·0831·220·99–1·500·061
  1. Q quartile, RR relative risk, CI conference interval. Mercury quartile range: Q1 0.39–1.04 μg/L; Q2 1.04–2.10 μg/L; Q3 2.12–3.68 μg/L; Q4 3.70–27.8 μg/L.
  2. Adjusted for maternal age, race, smoking, education, parity, pre-pregnancy overweight or obesity, diabetes, hypertensive disorder, preterm birth, fetal growth pattern, and breastfeeding status