Table 6. Sensitivity, specificity, positive and negative predictive values of awareness of hypertension 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		55.5 (52.4–58.6)	91.4 (90.2–92.6)	75.8 (72.6–78.9)	80.9 (79.3–82.5)
Occupational social class	Managerial & professional	56.2 (50.9–61.6)	93.8 (92.1–95.4)	78.7 (73.5–84.0)	83.9 (81.5–86.3)
	Intermediate	47.8 (40.9–54.7)	91.0 (88.3–93.8)	71.6 (64.0–79.3)	78.6 (75.0–82.2)
	Routine and manual	58.5 (54.0–63.0)	89.3 (87.2–91.4)	75.4 (70.9–79.8)	79.3 (76.7–81.9)
Educational attainment	Post-school qualifications	51.6 (46.3–56.9)	93.5 (92.0–95.1)	74.2 (68.6–79.7)	84.3 (82.1–86.5)
	School level qualifications	53.3 (48.2–58.4)	91.2 (89.3–93.1)	72.2 (66.9–77.6)	81.9 (79.5–84.4)
	No qualifications	63.1 (57.5–68.7)	83.8 (79.3–88.3)	81.5 (76.4–86.6)	66.7 (61.5–71.9)
Household income	Highest	50.3 (43.0–57.6)	93.9 (92.0–95.8)	70.9 (63.0–78.8)	86.4 (83.8–89.1)
	Middle	54.6 (49.8–59.3)	92.4 (90.6–94.2)	77.9 (73.2–82.6)	80.5 (78.1–83.0)
	Lowest	59.0 (54.2–63.9)	87.2 (84.5–90.0)	75.7 (70.8–80.5)	73.9 (72.6–79.2)

Bold indicates significantly different from the least disadvantaged level