Table 3.

Logistic odds ratio (95 % confidence intervals) for cognitive impairment and blood pressure categories among Chinese elderly.^†

Variables	Unadjusted	Basic model‡	Final model§
SBP
Low(SBP<127mmHg, n=2324)	1.25(1.12–1.41)†	1.15(1.00–1.32)*	1.18(1.02–1.35)*
Medium-low (127≤ SBP<141mmHg, n=2409)	1.00 reference	1.00 reference	1.00 reference
Medium-high (141≤ SBP<155mmHg, n=1284)	1.00 reference	1.00 reference	1.00 reference
High(SBP≥155mmHg, n=1127)	1.21(1.02–1.42)*	1.18(0.99–1.42)	1.23(1.02–1.49)*
DBP
Low(DBP<77mmHg, n=2536)	1.33(1.19–1.49)†	1.20(1.05–1.36)†	1.20(1.05–1.37)†
Medium-low (77≤ DBP<85mmHg, n=2644)	1.00 reference	1.00 reference	1.00 reference
Medium-High (85≤ DBP<90mmHg, n=989)	1.00 reference	1.00 reference	1.00 reference
High(DBP≥90mmHg, n=975)	1.26(1.07–1.50)†	1.26(1.04–1.52)*	1.24(1.02–1.52)*
PP
Low(PP<49mmHg, n=2523)	1.18(1.05–1.32)†	1.08(0.95–1.23)	1.09(0.95–1.25)
Medium-low (49≤ PP<62mmHg, n=2588)	1.00 reference	1.00 reference	1.00 reference
Medium-high (62≤ PP<73mmHg, n=1035)	1.00 reference	1.00 reference	1.00 reference
High (PP≥73mmHg, n=998)	1.04(0.87–1.24)	0.90(0.74–1.10)	1.04(0.84–1.28)
MAP
Low(MAP<93mmHg, n=2560)	1.31(1.17–1.48)†	1.15(1.00–1.33)	1.15(1.00–1.34)*
Medium-low (93≤ MAP<103mmHg, n=2232)	1.00 reference	1.00 reference	1.00 reference
Medium-high (103≤ MAP<110mmHg, n=1 186)	1.00 reference	1.00 reference	1.00 reference
High (MAP≥1 10mmHg, n=1 166 )	1.21(0.99–1.33)	1.20(0.99–1.44)	1.22(1.01–1.48)*

^*p<0.05

^†p<0.01.

^‡Adjusted for demographic variables including age (year), gender, education level (year), residence in basic model, §Further adjusted physical activity, vision, waist circumference, type 2 diabetes mellitus, cardiovascular diseases and stroke and cerebrovascular diseases in final model.

DBP diastolic blood pressure; MAP mean arterial pressure, PP pulse pressure, SBP systolic blood pressure.