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Table 1 Baseline characteristics of the trial participants

From: Prominent positioning and food swaps are effective interventions to reduce the saturated fat content of the shopping basket in an experimental online supermarket: a randomized controlled trial

  Control Swaps Altering order Combined
(n = 310) (n = 310) (n = 310) (n = 310)
Age, years, mean ± SD 37.5 ± 11.7 37.8 ± 12.9 38.2 ± 12.7 37.2 ± 11.7
Sex, female, n (%) 193 ± 62.3 207 ± 66.8 214 ± 69 203 ± 65.5
BMI, kg/m2, mean ± SD 27.8 ± 7.2 27.9 ± 7.3 27.8 ± 6.4 27.4 ± 6.3
BMI category, n (%)
  < 18.5 5 (1.6) 5 (1.6) 7 (2.3) 7 (2.3)
18.5–24.9 113 (36.5) 130 (41.9) 113 (36.5) 123 (39.7)
25–29.9 101 (32.6) 79 (25.5) 89 (28.7) 90 (29)
  > 30 87 (28.1) 95 (30.6) 96 (31) 86 (27.7)
Missing 4 (1.3) 1 (0.3) 5 (1.6) 4 (1.3)
Ethnic group, n (%)
White 272 (87.7) 285 (91.9) 285 (91.9) 280 (90.3)
Asian/Black 20 (6.5) 10 (3.2) 13 (4.2) 16 (5.2)
Mixed/Other 18 (5.8) 14 (4.5) 11 (3.5) 13 (4.2)
Missing 0 (0) 1 (0.3) 1 (0.3) 1 (0.3)
Education, n (%)
None 7 (2.3) 11 (3.5) 17 (5.5) 10 (3.2)
Secondary 74 (23.9) 105 (33.9) 108 (34.8) 86 (27.7)
Higher 229 (73.9) 193 (62.3) 184 (59.4) 213 (68.7)
Missing 0 (0) 1 (0.3) 1 (0.3) 1 (0.3)
Household income, n (%)
Lower (£25 k) 124 (40) 142 (45.8) 135 (43.5) 125 (40.3)
Middle (£26-39 k) 93 (30) 70 (22.6) 77 (24.8) 79 (25.5)
Higher (£40 k) 83 (26.8) 90 (29) 83 (26.8) 95 (30.6)
Missing 10 (3.2) 8 (2.6) 15 (4.8) 11 (3.5)
Household size, median (IQR) 3.0 (2–4) 3.0 (2–4) 3.0 (2–4) 3.0 (2–4)
Household average supermarket expenditure, £, median (IQR) 70.0 (50–100) 60.0 (45–90) 60.0 (50–85) 60.0 (50–100)
Online grocery shopping, n (%)
  > =1/week 21 (6.8) 18 (5.8) 27 (8.7) 32 (10.3)
1–3 times/month 42 (13.5) 38 (12.3) 54 (17.4) 62 (20)
4–11 times in the last year 78 (25.2) 76 (24.5) 79 (25.5) 74 (23.9)
1–3 times in the last year 91 (29.4) 91 (29.4) 71 (22.9) 72 (23.2)
Never or not in the last year 78 (25.2) 87 (28.1) 78 (25.2) 69 (22.3)
Missing 0 (0) 0 (0) 1 (0.3) 1 (0.3)
Online non-grocery shopping, n (%)
  > =1/week 35 (11.3) 43 (13.9) 27 (8.7) 33 (10.6)
1–3 times/month 137 (44.2) 124 (40) 129 (41.6) 133 (42.9)
4–11 times in the last year 102 (32.9) 105 (33.9) 119 (38.4) 115 (37.1)
1–3 times in the last year 30 (9.7) 31 (10) 30 (9.7) 25 (8.1)
Never or not in the last year 6 (1.9) 7 (2.3) 4 (1.3) 3 (1)
Missing 0 (0) 0 (0) 1 (0.3) 1 (0.3)
History of, n (%)
Heart Disease 0 (0) 1 (0.3) 4 (1.3) 3 (1)
High cholesterol 26 (8.4) 20 (6.5) 25 (8.1) 12 (3.9)
High blood pressure 26 (8.4) 31 (10) 28 (9) 20 (6.5)
Diabetes 12 (3.9) 11 (3.5) 7 (2.3) 5 (1.6)
Cancer 5 (1.6) 9 (2.9) 6 (1.9) 7 (2.3)
Chronic Obstructive Pulmonary Disease 5 (1.6) 2 (0.6) 4 (1.3) 3 (1)