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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 3.

Fecundability hazard ratios (FHR) and 95% confidence intervals (CI) for time to pregnancy (TTP) associated with drinking water arsenic exposure among planned and unplanned pregnancies (n = 287).

Predictor a FHR 95% CI P-value
Average arsenic level (μg/L) 1.01 1.00, 1.01 0.30
Maternal age (years) 1.04 1.02, 1.06 0.0004
High school diploma/some college/technical school b 0.96 0.69, 1.33 0.79
University diploma b 1.07 0.78, 1.47 0.68
Smoked > 100 lifetime cigarettes c 0.91 0.71, 1.17 0.45
Maternal age (years) x log TTP (cycles) 0.87 0.85, 0.98 < 0.0001
Average arsenic level (μg/L) x log TTP (cycles) 0.97 0.94, 0.98 0.01

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.