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Table 2 Baseline characteristics of the linked sample of CHHiP participants based on additional information extracted from primary care data

From: Linkage of the CHHiP randomised controlled trial with primary care data: a study investigating ways of supplementing cancer trials and improving evidence-based practice

Baseline characteristic n (% of recorded) Mean (SD) of recorded Missing
n (% of 106 linked sample)
Ethnicity    37 (35)
 White 64 (93)   
 Black 4 (6)   
 Asian 1 (1)   
Index of multiple deprivation, quintile    13 (12)
 1 (≥ 33.881, most deprived) 7 (8)   
 2 14 (15)   
 3 15 (16)   
 4 20 (22)   
 5 (≤ 8.372, least deprived) 37 (40)   
Body mass index (kg/m2)   28 (5) 61 (57)
Obesity (body mass index ≥30) 12 (27)   
Systolic blood pressure (mmHg)   141 (20) 48 (45)
Diastolic blood pressure (mmHg)   78 (11) 48 (45)
Total cholesterol (mmol/l)   4.7 (1.0) 68 (64)
High-density lipoprotein (mmol/l)   1.3 (0.3) 73 (69)
Smoking status    27 (25)
 Active smoker 5 (6)   
 Ex-smoker 43 (54)   
 Non-smoker 31 (39)   
Alcohol consumption    20 (19)
 Non-drinker 10 (12)   
 Safe 51 (59)   
 Hazardous 21 (24)   
 Alcoholism 4 (5)