Table 2 Self-reported versus urine-toxicology-detected amphetamine-type stimulant use among women participating in the Young Women’s Health Study-2

Urine toxicology result (n)

Positive

Negative

Self-reported use

Yes

25

6

No

3

166

Percentage

95% CI

Sensitivity

89.3

77.8–100

Specificity

96.5

93.8–99.2

Positive predictive value

80.6

66.7–94.5

Negative predictive value

98.2

96.2–100