Development and validation of a screening instrument for borderline personality disorder (SI-Bord) for use among university students

Table 2 Sensitivity and specificity using each cut-off score (N = 68)

Criterion	Sensitivity	95% CI	Specificity	95% CI	+PV	95% CI	-PV	95% CI	Cost^a
≥1	100.00	79.4–100.0	0.00	0.0–6.8	23.5	23.5–23.5			0.765
> 1	100.00	79.4–100.0	7.69	2.1–18.5	25.0	23.6–26.5	100.0		0.706
> 2	100.00	79.4–100.0	15.38	6.9–28.1	26.7	24.5–29.0	100.0		0.647
> 3	100.00	79.4–100.0	21.15	11.1–34.7	28.1	25.3–31.0	100.0		0.603
> 4	93.75	69.8–99.8	40.38	27.0–54.9	32.6	27.2–38.5	95.5	75.4–99.3	0.471
> 5	93.75	69.8–99.8	50.00	35.8–64.2	36.6	29.9–43.8	96.3	79.3–99.4	0.397
> 6	75.00	47.6–92.7	63.46	49.0–76.4	38.7	28.6–49.9	89.2	77.5–95.2	0.338
> 7	75.00	47.6–92.7	73.08	59.0–84.4	46.2	33.5–59.3	90.5	80.0–95.8	0.265
> 8	62.50	35.4–84.8	82.69	69.7–91.8	52.6	35.4–69.2	87.8	79.0–93.2	0.221
>9^b,c	56.25	29.9–80.2	92.31	81.5–97.9	69.2	44.4–86.4	87.3	79.6–92.3	0.162
> 10	37.50	15.2–64.6	96.15	86.8–99.5	75.0	40.1–93.1	83.3	77.3–88.0	0.176
> 11	31.25	11.0–58.7	98.08	89.7–100.0	83.3	38.6–97.5	82.3	76.9–86.6	0.176
> 12	12.50	1.6–38.3	100.00	93.2–100.0	100.0		78.8	75.5–81.7	0.206
> 13	6.25	0.2–30.2	100.00	93.2–100.0	100.0		77.6	75.3–79.7	0.221
> 14	0.00	0.0–20.6	100.00	93.2–100.0			76.5	76.5–76.5	0.235

+PV positive predictive value, −PV negative predictive value, CI confidence interval, ^aTaking into account disease prevalence (23.5%) and estimated costs, ^bYouden index J, ^cOptimal criterion

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