Table 7. Sensitivity, specificity, positive and negative predictive values of awareness of diabetes by markers of socio-economic position, Scottish Health Survey, 2008–11.

Marker of socio-economic position	Level	Sensitivity, (95% CI)	Specificity, (95% CI)	PPV, (95% CI)	NPV, (95% CI)
All		63.3 (56.1–70.6)	99.1 (98.8–99.5)	83.0 (76.5–89.4)	97.6 (97.0–98.2)
Occupational social class	Managerial & professional	60.0 (47.1–73.0)	99.2 (98.6–99.7)	80.5 (68.4–92.6)	97.8 (96.8–98.7)
	Intermediate	52.9 (36.2–69.7)	99.8 (99.4–100)	94.7 (84.7–100)	96.9 (95.5–98.4)
	Routine and manual	69.5 (59.6–79.5)	98.9 (98.2–99.5)	82.6 (73.7–91.6)	97.7 (96.8–98.6)
Educational attainment	Post-school qualifications	63.3 (49.8–76.8)	99.6 (99.2–100)	88.6 (78.0–99.1)	98.3 (97.6–99.1)
	School level qualifications	63.8 (51.4–76.2)	99.6 (99.2–100)	90.2 (81.2–99.3)	98.0 (97.1–98.8)
	No qualifications	61.9 (49.9–73.9)	97.0 (95.4–98.6)	75.0 (63.2–86.8)	94.6 (92.5–96.7)
Household income	Highest	61.5 (42.8–80.2)	99.9 (99.6–100)	94.1 (82.9–100)	98.6 (97.7–99.4)
	Middle	62.5 (51.3–73.7)	99.2 (98.6–99.7)	83.3 (73.4–93.3)	97.5 (96.6–98.4)
	Lowest	64.4 (53.4–75.4)	98.6 (97.8–99.4)	81.0 (71.0–91.1)	96.7 (95.5–98.0)

Bold indicates significantly different from the least disadvantaged level