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Table 2 Distribution of categorical variables in participants in two groups (N, %)

From: The effect of body mass index and its interaction with family history on hypertension: a case–control study

   control group (n = 342) case group (n = 342)   
   n % n % x2 p
sex male 175 51.17 172 50.29 0.119 0.730
female 167 48.83 170 49.71
Education level Below primary 20 5.85 22 6.43 6.567 0.161
primary school 84 24.56 83 24.27
junior high 135 39.47 152 44.44
high school 69 20.18 67 19.59
≥college 34 9.94 18 5.26
family history no 131 38.30 32 9.36 80.048 <0.001
yes 211 61.70 310 90.64
body mass index low weight 12 3.51 5 1.46 63.165 <0.001
normal 194 56.73 103 30.12
overweight 112 32.75 166 48.54
obesity 24 7.02 68 19.88
waist-to-hip ratio normal 74 21.64 53 15.50 4.492 0.034
abnormal 268 78.36 289 84.50
blood type AB 41 11.99 33 9.65 3.523 0.620
A 52 15.20 57 16.67
B 49 14.33 55 16.08
O 65 19.01 72 21.05
unknown 135 39.47 125 36.55
occupation physical labor 154 45.03 152 44.44 12.197 0.016
mental work 90 26.32 71 20.76
freelance 26 7.60 17 4.97
  no job 72 21.05 102 29.82
work/life pressure no 217 63.45 222 64.91 3.08 0.544
little 96 28.07 85 24.85
more 23 6.73 24 7.02
great 6 1.75 10 2.92
Living environmental noise no 231 67.54 223 65.20 3.22 0.521
little 85 24.85 89 26.02
more 21 6.14 27 7.89
great 5 1.46 3 0.88
Personal taste salty 65 19.01 88 25.73 5.738 0.057
light 104 30.41 110 32.16
balance 172 50.29 146 42.69
sleeping time inadequate 43 12.57 35 10.23 6.998 0.072
satisfy 31 9.06 49 14.33
sufficient 268 78.36 258 75.44
Sports habit never 64 18.71 65 19.01 1.454 0.483
occasionally 116 33.92 129 37.72
regular 162 47.37 148 43.27
drinking behavior never 236 69.01 251 73.39 2.068 0.558
occasionally 65 19.01 59 17.25
often 38 11.11 33 9.65
smoking behavior never 225 65.79 219 64.04 6.544 0.087
Quit now 22 6.43 40 11.70
occasionally 20 5.85 24 7.02
always 72 21.05 61 17.84