Table 3.

Sensitivity and specificity of the clinical prediction rule in identifying different sexual risk experiences

Outcome	CPR score	Participants self-reporting as at risk (n)	Sensitivity (95% CI)	Participants self-reporting as not at risk (n)	Specificity (95% CI)
2+ male sexual partners in last year
	≤8	50	Not calculated	83	Not calculated
	9	19	83.2 (79.3 to 86.5)	18	56.1 (51.3 to 60.6)
	10	38	76.8 (72.7 to 80.7)	11	68.2 (63.7 to 72.5)
	11	27	64.0 (59.4 to 68.4)	13	75.7 (71.5 to 80.0)
	12	34	54.9 (50.2 to 59.6)	9	84.5 (80.8 to 87.7)
	≥13	129	Not calculated	14	Not calculated
Total		297		148
Combined 2+ partners or risk from partner
	≤4	20	Not calculated	22	Not calculated
	5	18	94.2 (91.7 to 96.3)	16	25.3 (21.4 to 29.8)
	6	16	89.1 (85.7 to 91.8)	8	43.7 (39.0 to 48.5)
	7	22	84.6 (80.9 to 87.9)	8	52.9 (48.1 to 57.6)
	8	33	78.3 (74.1 to 82.0)	12	62.0 (57.3 to 66.6)
	9	30	69.0 (64.5 to 73.4)	5	75.9 (71.7 to 79.9)
	10	50	60.3 (55.7 to 65.0)	6	81.6 (77.7 to 85.2)
	≥11	161	Not calculated	10	Not calculated
Total		350		87
Risk of unintended pregnancy in the last 6 months
	≤2	28	Not calculated	130	Not calculated
	3	29	82.5 (78.6 to 86.0)	70	48.3 (43.4 to 53.1)
	4	15	64.4 (59.6 to 68.9)	20	74.3 (70.0 to 78.4)
	5	10	55.0 (50.2 to 59.8)	16	81.8 (77.8 to 85.4)
	6	19	48.8 (43.9 to 53.6)	6	87.7 (84.2 to 90.6)
	≥7	59	Not calculated	27	Not calculated
Total		160		269

CPR, clinical prediction rule.