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Table 1 Baseline characteristics of the total sample and the sample by the different trajectory groupsa

From: Body mass index and trajectories of the cognition among Chinese middle and old-aged adults

   TRAJECTORY GROUP  
CHARACTERISTIC TOTAL SAMPLE
(n = 5693)
RAPID DECLINE
(n = 361)
SLOW DECLINE
(n = 2101)
STABLE
(3231)
Pb
BMI
Underweight (< 18.5)
Normal (18.5–23.9)
Overweight (24–27.9)
Obesity (> = 28)
Age
211(3.71)
2540(44.62)
1596(27.93)
1352(23.75)
28(7.76)
171(47.37)
83(22.99)
79(21.88)
105(5.00)
1021(48.60)
564(26.84)
411(19.56)
78(2.41)
1348(41.72)
943(29.19)
862(26.68)
 < 0.001
mean(SD)c 57.07(8.16) 60.91(9.76) 58.29(8.11) 55.85(7.73)  < 0.001
45–54 2340(41.10) 96(26.59) 729(34.70) 1515(46.89)  < 0.001
55–64 2303(40.45) 148(41.00) 890(42.36) 1265(39.15)  
65–74 901(15.83) 77(21.33) 420(19.99) 404(12.50)  
75–84 149(2.62) 40(11.08) 62(2.95) 47(1.45)  
Male 3042(53.44) 145(40.28) 1075(51.17) 1822(56.39)  < 0.001
Married 5243(92.10) 308(85.32) 1918(91.29) 3017(93.38)  < 0.001
Years of schooling       < 0.001
 0 612(10.75) 143(39.61) 371(17.66) 98(3.03)  
 1–6 2465(43.30) 151(41.83) 1163(55.35) 1151(35.62)  
  >  = 7 2616(45.95) 67(18.56) 567(26.99) 1982(61.34)  
Medical insurance 5410(95.0) 337(93.35) 1996(95.00) 3077(95.23) 0.295
Social activities 2317(40.70) 145(40.17) 720(34.27) 1452(44.92) < 0.001
Chronic diseases      0.052
 none 1967(34.55) 123(34.07) 676(32.18) 1168(36.15)  
 1–3 3317(58.26) 215(59.56) 1266(60.26) 1836(56.82)  
  > 3 409(7.18) 23(6.03) 159(7.57) 227(7.03)  
Physical activities 2519(44.25) 161(44.60) 880(41.88) 1478(45.74) 0.021
Sleeping time, mean(SD)c 6.50(1.65) 6.14(1.90) 6.39(1.76) 6.61(1.53) < 0.001
MMSE score, mean(SD)c 13.63(2.18) 12.29(2.01) 12.20(1.63) 14.71(1.88) < 0.001
  1. aData are presented as counts (percentage) unless otherwise indicated
  2. bP value determined using χ2 test or analysis of variance F-test
  3. cFor continuous variables, mean (SD) for each trajectory group and significance from analysis of variance F-test are reported