Table 1 Participants’ baseline characteristics by quintile groups of composite cognitive scores, Selenium and Cognitive Decline Study, People’s Republic of China, December 2003 – April 2012
From: Cognitive function, body mass index and mortality in a rural elderly Chinese cohort
Cognitive quintile groups | ||||||
|---|---|---|---|---|---|---|
Quintile 1 | Quintile 2 | Quintile 3 | Quintile 4 | Quintile 5 | ||
(n = 400) | (n = 400) | (n = 400) | (n = 400) | (n = 400) | p value | |
Mean age, years (SD) | 75.3(6.1) | 72.8(5.6) | 71.6(5.3) | 70.5(4.5) | 69.5(4.3) | <.0001 |
Female (%) | 297(74.3) | 240(60.0) | 226(56.5) | 184(46.0) | 132(33.0) | <.0001 |
Ever attended school (%) | 52(13.0) | 109(27.3) | 145(36.3) | 177(44.3) | 270(67.5) | <.0001 |
Marital status (%) | <.0001 | |||||
Married | 198(49.5) | 231(57.8) | 252(63.0) | 276(69.0) | 294(73.5) | |
Widowed | 201(50.3) | 165(41.3) | 142(35.5) | 118(29.5) | 100(25.0) | |
Other | 1(0.3) | 4(1.0) | 6(1.5) | 6(1.5) | 6(1.5) | |
Household composition (%) | <.0001 | |||||
Live with spouse | 152(38.0) | 187(46.8) | 194(48.5) | 232(58.0) | 248(62.0) | |
Live with children | 158(39.5) | 114(28.5) | 120(30.0) | 87(21.8) | 66(16.5) | |
Live with spouse and children | 22(5.5) | 24(6.0) | 21(5.3) | 26(6.5) | 28(7.0) | |
Other | 68(17.0) | 75(18.8) | 65(16.3) | 55(13.8) | 58(14.5) | |
Smoking (%) | 128(32.0) | 155(38.8) | 195(48.8) | 209(52.3) | 241(60.3) | <.0001 |
Consume alcohol (%) | 133(33.3) | 157(39.3) | 183(45.8) | 180(45.0) | 220(55.0) | <.0001 |
Body mass index, kg/m2 | 20.9(3.2) | 21.5(3.3) | 21.9(3.4) | 22.5(3.5) | 22.9(3.8) | <.0001 |
BMI groups: | ||||||
Underweight | 85(21.3) | 59(14.8) | 53(13.3) | 36(9.0) | 39(9.8) | <.0001 |
Normal weight | 274(68.5) | 291(72.8) | 277(69.3) | 286(71.5) | 257(64.3) | |
Overweight | 37(9.3) | 43(10.8) | 60(15.0) | 66(16.5) | 88(22.0) | |
Obese | 4(1.0) | 7(1.8) | 10(2.5) | 12(3.0) | 16(4.0) | |
Systolic blood pressure, mmHg (SD) | 145.2(25.3) | 144.0(23.4) | 145.9(25.1) | 147.1(24.7) | 146.2(26.0) | 0.4693 |
Diastolic blood pressure, mmHg (SD) | 83.1(12.8) | 83.2(12.3) | 83.7(13.1) | 84.2(12.3) | 84.0(12.7) | 0.6546 |
History of (%) | ||||||
Cancer | 0(0.0) | 3(0.8) | 3(0.8) | 3(0.8) | 4(1.0) | 0.4686 |
Parkinson’s disease | 5(1.3) | 1(0.3) | 4(1.0) | 6(1.5) | 2(0.5) | 0.3062 |
Diabetes | 10(2.5) | 10(2.5) | 9(2.3) | 9(2.3) | 14(3.5) | 0.7911 |
Hypertension | 228(57.0) | 222(55.5) | 235(58.8) | 254(63.5) | 231(57.8) | 0.1936 |
Stroke | 16(4.0) | 7(1.8) | 18(4.5) | 10(2.5) | 11(2.8) | 0.1492 |
Heart attack | 12(3.0) | 8(2.0) | 14(3.5) | 11(2.8) | 24(6.0) | 0.0247 |
Head injury | 28(7.0) | 17(4.3) | 29(7.3) | 21(5.3) | 23(5.8) | 0.3465 |
Fracture | 7(1.8) | 9(2.3) | 14(3.5) | 9(2.3) | 12(3.0) | 0.5476 |
APOE genotype, ϵ4 carriers (%) | 84(21.0) | 66(16.5) | 60(15.0) | 63(15.8) | 60(15.0) | 0.1226 |