External validation of two prediction models identifying employees at risk of high sickness absence: cohort study with 1-year follow-up

Table 2 Prognostic characteristics of the episodes model at external validation

Cut off probability	N	sens^a	spec^b	PPV^c	NPV^d
≥10%	251	0.79	0.62	0.22	0.96
≥20%	139	0.59	0.81	0.29	0.94
≥30%	85	0.38	0.89	0.31	0.91
≥40%	60	0.28	0.92	0.32	0.91
≥50%	33	0.22	0.97	0.45	0.91
≥60%	20	0.13	0.98	0.45	0.90
≥70%	9	0.09	0.99	0.67	0.89
≥80%	8	0.09	1.00	0.75	0.89
≥90%	4	0.04	1.00	0.75	0.88

^a sensitivity; ^b specificity; ^c positive predictive value; ^d negative predictive value.
The table shows the prognostic characteristics for each cut-off SA probability of the model identifying office workers (N = 593) with high SA episodes at external validation with fixed coefficients.

ISSN: 1471-2458