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

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

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]

N = number of nonmissing cases, IQR = Interquartile range. Values are unweighted.

ISSN: 1471-2458