Table 3.

Positive and Negative Likelihood Ratios of Apparent Age for the Detection of Poor Health. Poor Health Status Was Assessed by SF-12 Physical and/or Mental Health Scores, Using Four Different Criteria Based on Number of SD Below the Age Group Norm. IQR Denotes Interquartile Range

	Apparent age
	Looking ≥1 year older than actual age		Looking ≥5 years older than actual age		Looking ≥10 years older than actual age
Criterion used to define poor health status	LR+, Median (IQR)	LR-, Median (IQR)	LR+, Median (IQR)	LR-, Median (IQR)	LR+, Median (IQR)	LR-, Median (IQR)
≥0.5 SD below norm	1.15 (1.00–1.32)	0.92 (0.81–0.99)	1.39 (1.04–1.93)*	0.92 (0.85–0.99)	1.49 (0.83–1.78)†	0.98 (0.96–1.00)
≥1.0 SD below norm	1.13 (1.04–1.35)	0.92 (0.82–0.98)	1.37 (1.10–1.83)	0.92 (0.88–0.96)	1.60 (0.87–2.40)‡	0.98 (0.96–1.00)
≥1.5 SD below norm	1.30 (1.19–1.64)	0.80 (0.70–0.86)	1.54 (1.26–2.00)	0.90 (0.84–0.94)	1.63 (1.38–2.75)§	0.98 (0.94–1.00)
≥2.0 SD below norm	1.29 (1.20–1.64)	0.78 (0.68–0.86)	1.72 (1.25–2.16)	0.87 (0.81–0.94)	1.96 (1.50–3.81)‖	0.97 (0.94–0.99)

^*LR+ undefined for n = 1 physician since specificity was 100%

^†LR+ undefined for n = 27 physicians since specificity was 100%

^‡LR+ undefined for n = 26 physicians since specificity was 100%

^§LR+ undefined for n = 19 physicians since specificity was 100%

^‖LR+ undefined for n = 18 physicians since specificity was 100%