Table 1.
Baseline characteristics in 2005 of participants followed up from 2005 to 2010 (the cohort), compared with subjects lost to follow-up and compared with 2010; PURE-NWP-SA study
| Baseline data in 2005 of participants followed up in 2010 | Baseline data in 2005 of subjects lost to follow-up in 2010 | Cohort data of participants in 2010 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Variable | n | Mean | sd | n | Mean | sd | P value* | n | Mean | sd | P value† |
| Age (years) | 1154 | 50·8 | 10·3 | 856 | 48·6 | 10·4 | <0·001 | 1154 | – | – | |
| Sex (male; %) | 1154 | 33·6 | 856 | 41·8 | <0·001 | 1154 | – | – | |||
| Locality (rural; %) | 1154 | 51·7 | 856 | 47·8 | 0·080 | 1154 | – | – | |||
| Education attainment (no formal education; %) | 1154 | 36·0 | 856 | 32·1 | 0·073 | 1154 | – | – | |||
| HIV positive (%) | 1154 | 17·1 | 856 | 22·2 | 0·004 | 1154 | 4·9 % new cases | – | |||
| BMI (kg/m2)‡ | 1154 | 25·1 | 7·0 | 853 | 24·1 | 7·0 | <0·001 | 1154 | 25·5 | 7·3 | <0·001 |
| Waist circumference (cm)‡ | 1147 | 80·3 | 12·8 | 843 | 79·0 | 13·3 | 0·007 | 1147 | 81·9 | 13·0 | <0·001 |
| HDL-cholesterol (mmol/l)‡ | 1087 | 1·54 | 0·61 | 805 | 1·48 | 0·66 | 0·006 | 1087 | 1·42 | 0·59 | <0·001 |
| n | Median | P25–P75 | n | Median | P25–P75 | P value* | n | Median | P25–P75 | P value† | |
| Energy intake (MJ/d) | 1154 | 7·4 | 5·6–10·1 | 796 | 6·9 | 4·7–9·8 | 0·003 | 1154 | 10·5 | 7·5–13·9 | <0·0001 |
PURE-NWP-SA, Prospective Urban and Rural Epidemiology in the North West Province of South Africa; P25, 25th percentile; P75, 75th percentile.
*
P value for significance of differences between subjects followed up in 2010 and those lost to follow-up (categorical variables: χ 2 test; continuous variables: two-sample Wilcoxon test).
†
P value for significance of differences between the cohort in 2005 and 2010 (categorical variables: χ 2 test; continuous variables: two-sample Wilcoxon test).