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. Author manuscript; available in PMC: 2018 Apr 1.
Published in final edited form as: Environ Res. 2017 Jan 3;154:120–125. doi: 10.1016/j.envres.2016.12.030

Table 4.

Fecundability hazard ratios (FHR) and 95% confidence intervals (CI) for time to pregnancy (TTP) associated with drinking water arsenic exposure among planned pregnancies with TTP ≤ 12 cycles (n = 82).

Predictor a FHR 95% CI P-value
Average arsenic level (μg/L) 1.12 1.06, 1.19 < 0.0001
Maternal age (years) 1.34 1.23, 1.45 < 0.0001
High school diploma/some college/technical school b 0.84 0.39, 1.77 0.64
University diploma b 0.94 0.49, 1.79 0.85
Smoked > 100 lifetime cigarettes c 0.76 0.44, 1.31 0.32
Maternal age (years) x log TTP (cycles) 0.79 0.75, 0.83 < 0.0001
Average arsenic level (μg/L) x log TTP (cycles) 0.89 0.83, 0.94 0.0001

NOTE: Bold typeface indicates P < 0.05. FHR > 1.0 indicates a higher conditional likelihood for pregnancy and FHR < 1.0 indicates a lower conditional likelihood for pregnancy.

a

Effect estimates adjusted for all other variables in the table;

b

‘No high school diploma’ is reference category;

c

‘Smoked < 100 lifetime cigarettes’ is reference category.