Table 2 Population characteristics and baseline measurements in the Supreme Nudge trial (n = 361)
|  | Control supermarkets (n = 199) | Intervention supermarkets (n = 162) |
|---|---|---|
Baseline characteristics | ||
Age, years, mean (SD) | 57.2 (10.2) | 58.9 (11.5) |
Femalea, n (%) | 142 (71.4) | 120 (74.1) |
Educational attainment, n (%) | ||
 Low | 38 (19.1) | 46 (28.4) |
 Medium | 76 (38.2) | 50 (30.9) |
 High | 85 (42.7) | 66 (40.7) |
Household size, n adultsa (median [IQR]) | 2.0 [1.0] | 2.0 [1.0] |
Household size, n childrena, (median [IQR]) | 0.0 [1.0] | 0.0 [1.0] |
Smoking statusa, n (%) | ||
 Current smoker | 9 (4.5) | 11 (6.8) |
 Irregular smoker | 4 (2.0) | 3 (1.9) |
 Former smoker | 95 (47.7) | 74 (45.7) |
 Never smoked | 91 (45.7) | 73 (45.1) |
Prevalent type 2 diabetesa, n (%) | 15 (7.5) | 8 (4.9) |
Medication for type 2 diabetesa, n (%) | 14 (7.0) | 8 (4.9) |
Prevalent hypertensiona, n (%) | 32 (16.1) | 26 (16.0) |
Medication for hypertensiona, n (%) | 37 (18.6) | 34 (21.0) |
Prevalent hyperlipidaemiaa, n (%) | 23 (11.6) | 28 (17.3) |
Medication for hyperlipidaemiaa, n (%) | 28 (14.1) | 22 (13.6) |
Prevalent cardiovascular diseasea, n (%) | 23 (11.6) | 21 (13.0) |
Primary outcome | ||
Diet quality, scored 0 (low) to 150 (high), mean (SD) | 106.0 (18.3) | 103.9 (19.4) |
Secondary outcomes | ||
Cardiometabolic measures, mean (SD): | ||
 HbA1cb, mmol/mol | 37.2 (6.6) | 37.8 (8.4) |
 LDL-cholesterolc, mmol/L | 3.0 (1.0) | 3.1 (0.9) |
 HDL-cholesterold, mmol/L | 1.5 (0.4) | 1.6 (0.5) |
 Total cholesterole, mmol/L | 5.3 (1.5) | 5.4 (1.1) |
 Total cholesterol/HDL-ratioe | 3.7 (1.2) | 3.6 (1.3) |
 Triglyceridesf, mmol/L | 1.8 (0.9) | 1.8 (0.9) |
 Waist circumference femalesg, cm | 94.6 (13.8) | 93.1 (13.4) |
 Waist circumference malesh, cm | 104.1 (12.8) | 101.9 (10.1) |
Total percentage healthier food purchasingi | 47.7 (21.7) | 47.2 (22.9) |
Total customer satisfactionj, scored 1 (low) to 7 (high), mean (SD) | 5.5 (1.2) | 5.8 (1.0) |
Food-decision styles for vegetablesk, scored 1 (low) to 7 (high), mean (SD): | ||
 Reflective | 5.3 (1.2) | 5.2 (1.1) |
 Habitual | 5.0 (0.9) | 4.9 (1.0) |
 Impulsive | 3.4 (1.2) | 3.5 (1.2) |
Food-decision styles for snacksl, scored 1 (low) to 7 (high), mean (SD): | ||
 Reflective | 4.1 (1.5) | 3.8 (1.3) |
 Habitual | 3.2 (1.3) | 3.3 (1.4) |
 Impulsive | 3.6 (1.6) | 3.7 (1.5) |
Nudges and social cognitive factorsj, scored 1 (low) to 7 (high), mean (SD): | ||
 Health goals | 6.4 (0.9) | 6.3 (0.8) |
 Healthy shopping | 5.9 (1.0) | 6.1 (0.9) |
 Perceived social norm | 4.7 (0.9) | 4.7 (1.0) |
 Attractiveness healthy foods | 5.9 (1.1) | 5.9 (1.2) |