Development of a fall-risk assessment profile for community-dwelling older adults by using the National Health Interview Survey in Taiwan

Table 3 Sensitivity and specificity at different cut-off points in the total risk score

Cut-off in the total risk score	A(n)	B(n)	C(n)	D(n)	Sensitivity (%)	Specificity (%)	Σ%	PV+(%)	PV-(%)
0 vs. ≥1	1547	6029	51	729	96.8	10.8	107	20.4	93.5
0–1 vs. ≥2	1522	5773	76	985	95.2	14.6	110	20.9	92.8
0–2 vs. ≥3	1450	4923	148	1835	90.7	27.2	118	22.8	92.5
0–3 vs. ≥4	1401	4367	197	2391	87.7	35.4	123	24.3	92.4
0–4 vs. ≥5	1315	3808	283	2950	82.3	43.7	126	25.7	91.2
0–5 vs. ≥6	1201	3193	397	3565	75.2	52.8	128^a	27.3	90.0
0–6 vs. ≥7	1063	2621	535	4137	66.5	61.2	128^a	28.9	88.5
0–7 vs. ≥8	911	2091	687	4667	57.0	69.1	126	30.3	87.2
0–8 vs. ≥9	720	1427	878	5331	45.1	78.9	124	33.5	85.9
0–9 vs. ≥10	604	1099	994	5659	37.8	83.7	122	35.5	85.1
0–10 vs. ≥11	419	641	1179	6117	26.2	90.5	117	39.5	83.8
0–11 vs. ≥12	335	470	1263	6288	21.0	93.0	114	41.6	83.3
0–12 vs. ≥13	189	208	1409	6550	11.8	96.9	109	47.6	82.3
0–13 vs. ≥14	136	142	1462	6616	8.5	97.9	106	48.9	81.9
0–14 vs. ≥15	43	39	1555	6719	2.7	99.4	102	52.4	81.2
0–15 vs. ≥16	12	10	1586	6748	0.8	99.9	101	54.5	81.0
0–16 vs. ≥17	4	3	1594	6755	0.3	100.0	100	57.1	80.9

A, number of participants who were assigned to the high-risk group and who were fallers; B, number of participants who were assigned to the high risk group and who were not fallers; C, number of participants who were assigned to the low-risk group and who were fallers; D, number of participants who were assigned to the low-risk group and who were not fallers; Σ Sum of sensitivity (A/(A + C))and specificity (D/(B + D)); PV+: Positive predictive value (A/(A + B)); PV- Negative predictive value (D/(C + D))
^aMaximal sum of sensitivity and specificity

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