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. Author manuscript; available in PMC: 2018 Oct 1.
Published in final edited form as: Environ Res. 2017 Jun 9;158:72–81. doi: 10.1016/j.envres.2017.05.030

Table 3.

Regression coefficients between maternal log10 urine perchlorate concentrations (µg/L) and birthweight (grams) in the study population of pregnant women from San Diego County 2000–2003

Both sexes
Males
Females
Group N β1 SE p N β1 SE p N β1 SE p
All 1957 51.3 39.7 0.20 959 143.1 56.3 0.01 998 −38.3 56.0 0.49
Urinary iodide2
  <100 µg/L 629 87.2 68.2 0.20 313 177.3 91.7 0.05 316 −14.8 102.1 0.88
  100–300 µg/L 920 −34.7 57.8 0.55 444 25.4 84.6 0.76 476 −84.6 79.6 0.29
  >300 µg/L 408 185.2 113.3 0.10 202 301.1 161.5 0.06 206 −1.1 160.1 0.99
Gestational age
  <37 weeks 158 547.3 202.6 0.01 85 829.1 263.1 <0.001 73 230.4 319.1 0.47
  ≥37 weeks 1799 28.8 36.0 0.42 874 97.3 51.5 0.06 925 −39.5 50.2 0.43
Mothers birthplace
  Mexico 933 27.1 53.1 0.61 451 29.9 72.6 0.68 482 26.0 77.8 0.74
  US born
    All 882 95.3 63.0 0.13 445 297.2 91.9 <0.001 437 −95.1 86.4 0.27
    White 381 166.7 104.9 0.11 204 325.6 151.4 0.03 177 −34.8 144.7 0.81
    Hispanic 394 40.4 94.7 0.67 186 305.4 136.9 0.03 208 −186.0 129.3 0.15
    Other 107 137.3 144.4 0.34 55 408.3 202.5 0.05 52 −43.2 184.2 0.82
  Other birthplace 142 −39.0 167.9 0.82 63 23.8 255.6 0.93 79 −115.8 237.1 0.63

Abbreviations: β, regression coefficient; N, sample size; SE, standard error

1

Adjusted for urinary creatinine (log10), maternal age, maternal weight, race, and sex

2

Urinary iodide concentrations were not corrected for urinary creatinine concentrations