Secular Trends of the Impact of Overweight and Obesity on Hypertension in Yi People: Yi Migrant Study, 1996–2015
Table 1
Characteristics of participants by body mass index category and time period, Yi Migrant Study, 1996–2015.
Variable
BMIa category and time periodb
Underweight (BMI <18.5)
Normal weight (BMI 18.5–23.9)
Overweight/obesity (BMI ≥24.0)
Yi people
P1 n = 179
P2 n = 313
P3 n = 314
for trendc
P1 n = 1,084
P2 n = 2,511
P3 n = 1,696
for trendc
P1 n = 218
P2 n = 840
P3 n = 1,257
for trendc
Prevalence (%)
12.09
8.54
9.61
0.356
73.19
68.53
51.91
<0.001
14.72
22.93
38.48
<0.001
BMI (kg/m2)
17.54
17.59
17.27
0.117
20.94
21.22
21.32
<0.001
26.09
26.60
27.04
<0.001
Age, years
37.21
41.31
50.32
<0.001
33.82
38.52
45.23
<0.001
40.69
41.35
47.16
<0.001
Female (%)
44.13
51.76
66.24
<0.001
37.92
49.74
66.80
<0.001
39.91
46.43
66.43
<0.001
Hypertension (%)
3.35
2.24
9.24
0.022
3.69
5.69
11.56
<0.001
15.14
21.67
26.73
0.026
Yi farmers
n = 122
n = 213
n = 242
n = 649
n = 1,806
n = 1,107
n = 26
n = 283
n = 532
Prevalence (%)
15.31
9.25
12.86
0.371
81.43
78.45
58.85
<0.001
3.26
12.29
28.28
<0.001
BMI (kg/m2)
17.45
17.55
17.28
0.549
20.64
21.11
21.11
<0.001
26.21
25.95
26.83
<0.001
Age, years
38.84
44.25
50.59
<0.001
32.15
38.90
44.36
<0.001
33.81
38.55
44.35
<0.001
Female (%)
38.52
51.17
66.94
<0.001
34.67
50.94
65.31
<0.001
50.00
66.78
66.54
0.307
Hypertension (%)
2.46
2.35
8.68
0.016
3.08
4.82
9.76
<0.001
7.69
12.72
20.86
0.076
Yi migrants
n = 57
n = 100
n = 72
n = 435
n = 705
n = 589
n = 192
n = 557
n = 725
Prevalence (%)
8.33
7.34
5.19
0.734
63.60
51.76
42.50
<0.001
28.07
40.89
52.31
<0.001
BMI (kg/m2)
17.73
17.66
17.22
0.0333
21.4
21.5
21.73
0.047
26.07
26.92
27.20
<0.001
Age, years
33.74
35.06
49.44
<0.001
36.31
37.53
46.88
<0.001
41.62
42.77
49.22
<0.001
Female (%)
56.14
53.00
63.89
0.119
42.76
46.67
69.61
<0.001
38.54
36.09
66.34
<0.001
Hypertension (%)
5.26
2.00
11.11
0.855
4.60
7.94
14.94
0.013
16.15
26.21
31.03
0.014
Data are presented as mean or percentage, where appropriate. BMI: body mass index; P1: period 1; P2: period 2; P3: period 3. a: weight (kg)/height (m)2. b: period 1, 1996; period 2, 2007–2008; period 3, 2015. c: P-values for trend were adjusted age (except age-trend analysis) and sex (except female-trend analysis) using multiple linear regression, multiple logistic regression, and multinomial logistic regression, where appropriate.
