Table 1: Descriptive statistics for the estimated daily dose ( 𝜇 g/kg/day) of chlorpyrifos in thirteen children ages 2–5 using the simple pharmacokinetic model.

OverallSPK ISPK IISPK III

Mean (St. Dev.)0.98 (1.95)0.97 (1.19)0.87 (0.81)
Median0.370.820.92
N212326
95% confidence interval (lower, upper)(0.09, 1.86)(0.43, 1.51)(0.51, 1.24)
Min–max(0, 9.13)(0, 5.5)(0, 3.65)

Summer season

Mean (St. Dev.)0.55 (0.58)0.8 (1.0)0.73 (0.68)
Median0.340.270.52
N101113
95% confidence interval (lower, upper)(0.19, 0.91)(0.24, 1.37)(0.37, 1.09)
Min–max(0, 1.89)(0, 3.36)(0, 2.5)

Fall season

Mean (St. Dev.)1.3 (2.53)1.32 (1.42)1.13 (0.9)
Median0.420.970.94
N111213
95% confidence interval (lower, upper)(0, 2.67)(0.55, 2.09)(0.66, 1.6)
Min–max(0.05, 9.13)(0.2, 5.5)(0.23, 3.65)

Urban/suburban children

Mean (St. Dev.)0.48 (0.52)0.67 (0.64)0.63 (0.55)1
Median0.350.480.45
N111212
95% confidence interval (lower, upper)(0.19, 0.77)(0.31, 1.03)(0.32, 0.94)
Min–max(0.04, 1.88)(0.02, 2.27)(0.01, 1.97)

Agricultural children

Mean (St. Dev.)1.53 (2.73)1.51 (1.58)1.19 (0.92)1
Median0.881.061.04
N101114
95% confidence interval (lower, upper)(0.1, 2.96)(0.91, 2.11)(0.68, 1.7)
Min–max(0, 9.12)(0, 5.5)(0, 3.65)

1 Marginally significantly different (one-way ANOVA, 𝑃 = 0 . 0 7 7 ).