Table 1

Baseline characteristics for all subjects, by treatment group

Phone

n = 462

Internet

n = 464

Control

n = 460

All

n = 1386


Male, No. (%)

321 (69.5)

302 (65.1)

306 (66.5)

929 (67.0)


Age, mean (SD), y

43 (8.8)

43 (8.4)

43 (8.7)

43 (8.6)


BMI (SD), kg/m2

29.5 (3.5)

29.6 (3.4)

29.6 (3.7)

29.6 (3.5)


Highly educated, No. (%)a

271 (60.1)

281 (62.2)

255 (58.8)

807 (60.4)


Married/cohabiting, No. (%)a

380 (84.3)

384 (85.1)

368 (84.8)

1132 (84.7)


Born in the Netherlands, No. (%)b

416 (92.7)

417 (93.3)

401 (94.1)

1234 (93.3)


Medication for certain conditions, No. (%)c

80 (18.6)

77 (17.8)

67 (16.5)

224 (17.7)


Smokes ≥ 1 unit/day, No. (%)c

73 (16.3)

59 (13.2)

65 (15.3)

197 (14.9)


Weight loss attempts previous 2 yrs, No. (%)e


0 attempts

147 (32.9)

141 (31.6)

141 (33.2)

429 (32.5)


1 – 3 attempts

212 (47.7)

202 (45.3)

196 (46.1)

610 (46.3)


4 or more attempts

88 (19.7)

103 (23.1)

88 (20.7)

279 (21.2)


Tried to prevent weight gain in previous 2 yrs, No. (%)e

353 (79.1)

370 (83.0)

347 (81.5)

1070 (81.2)


At baseline wants to, No. (%)e


Loose weight

386 (86.2)

373 (83.8)

363 (85.6)

1122 (85.2)


Prevent weight gain

56 (12.5)

67 (15.1)

55 (13.0)

178 (13.5)


Neither are important

6 (1.3)

4 (1.6)

5 (1.1)

17 (1.3)


SD = Standard Deviation, a n = 1337, b n = 1322, c n = 1269, c n = 1320, e n = 1318

van Wier et al. BMC Public Health 2009 9:6   doi:10.1186/1471-2458-9-6

Open Data