Table 4.

Sensitivity and specificity for predicting participants with a weekly personal magnetic field exposure metric exceeding or not exceeding thresholds (mG) using a single daily personal magnetic field exposure metric surrogate (wear time data only)

Metric	Threshold1	Sensitivity2,3	Specificity2,3
TWA	≥0.8	0.76	0.75
	≥1.3	0.69	0.92
	≥1.9	0.51	0.95
Median	≥0.5	0.80	0.81
	≥0.9	0.83	0.92
	≥1.5	0.58	0.94
90th%tile	≥1.6	0.68	0.73
	≥2.5	0.64	0.88
	≥3.9	0.62	0.95
95th%tile	≥2.3	0.67	0.75
	≥3.4	0.57	0.85
	≥5.1	0.43	0.94
99th%tile	≥4.4	0.62	0.72
	≥6.8	0.41	0.82
	≥11.3	0.26	0.92
Maximum	≥10.1	0.54	0.83
	≥16.04	0.36	0.88
	≥37.4	0.20	0.95

TWA, time-weighted average;

¹thresholds defined as the 50^th, 75^th, and 90^th percentiles of the daily personal magnetic field exposure metrics;

²each daily personal magnetic field exposure metric surrogate was not included in the calculation of the weekly personal magnetic field exposure metric;

³677 sampling days from 100 women;

⁴reported by Li et al. (2002) as the threshold above which there is an increased risk of miscarriage, 16.0 mG is about the 70^th percentile of the daily personal magnetic field exposure maximums.