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Table 1 Descriptive statistics for the adult sub-sample of the National Income Dynamics Study

From: Analysing the socioeconomic determinants of hypertension in South Africa: a structural equation modelling approach

Variable N Median/percentage IQR/frequency Range
Men 15 574 40.2% 6 260  
Age 15 549    
    15–24   30.4% 4 730  
    25–34   18.9% 2 936  
    35–44   16.8% 2 613  
    45–54   14.0% 2 174  
    55–64   10.0% 1 556  
    65+   9.9% 1 540  
Race 15 574    
    Black   78.5% 12 221  
    Coloured   14.2% 1 215  
    Asian   1.4% 224  
    White   5.9% 914  
Individual income (ZAR) 15 276 600 [0 ; 1 200] [0 ; 1 517 000]
Education 15 545    
    None   14.0% 2 178  
    Primary   16.7% 2 603  
    Secondary   60.17% 9 353  
    Tertiary   9.1% 1 411  
Average quantity of alcohol
per drinking occasion 15 505    
    Non drinker   75.8% 11 747  
    1/2 standard drinks   7.2% 1 121  
    3/4 standard drinks   6.7% 1 041  
    5/6 standard drinks   4.8% 747  
    7/8 standard drinks   2.3% 363  
    9/12 standard drinks   1.7% 264  
    13+   1.4% 222  
Ever smoked 15 505 25.6% 3 971  
Current smoking 15 227    
    No   80.3% 12 230  
    < 20 cigarettes/day   17.5% 2 658  
    ≥ 20 cigarettes/day   2.2% 339  
Physical exercise 15 471    
    Never   70.1% 10 845  
    < once a week   5.8% 900  
    Once a week   5.6% 863  
    Twice a week   6.1% 944  
    ≥ three times a week   12.4% 1 919  
SBP (mmHg) 13 852 121.5 [110 ; 137] [80 ; 240]
DBP (mmHg) 13 836 79.5 [71 ; 89.5] [31.5 ; 137]
HR (bpm) 14 025 75.5 [67 ; 84] [32.5 ; 147]
BMI (kg/m 2) 13 858 24.4 [20.9 ; 29.7] [7.1 ; 97.3]
  1. N = number of nonmissing cases, IQR = Interquartile range. Values are unweighted.