Table 1 Background characteristics of women randomized to one of three invitation letters to participate in cervical cancer screening

Age (years), mean (SD)

45.3 (12.3)

45.3 (11.9)

44.7 (12.1)

45.1 (12.1)

Age distribution (years)

  <30

147 (12.6)

126 (10.6)

155 (13.1)

428 (12.1)

11.1%

  30-39

274 (23.5)

295 (24.9)

288 (24.3)

857 (24.2)

23.7%

  40-49

278 (23.8)

308 (26.0)

301 (25.4)

887 (25.1)

24.8%

  50-59

286 (24.5)

287 (24.2)

272 (23.0)

845 (23.9)

21.8%

  60-69

183 (15.7)

171 (14.4)

169 (14.3)

523 (14.8)

18.6%

Personal income (Kroner)

n = 1 079

n = 1 094

n = 1 108

n = 3 281

  <200 000

134 (12.4)

127 (11.6)

135 (12.2)

396 (12.1)

22.5%

  200 000–399 999

521 (48.3)

541 (49.5)

524 (47.3)

1 586 (48.3)

48.0%

  400 000–599 999

371 (34.4)

361 (33.0)

373 (33.7)

1 105 (33.7)

20.8%

  600 000–799 999

37 (3.4)

47 (4.3)

69 (6.2)

153 (4.7)

6.2%

  ≥800 000

16 (1.5)

18 (1.6)

7 (0.6)

41 (1.2)

2.5%

Geographic location

  Oslo

293 (25.1)

325 (27.4)

284 (24.0)

902 (25.5)

27.8%

  South East (excluding Oslo)

298 (25.5)

312 (26.3)

306 (25.8)

916 (25.9)

25.1%

  South West

372 (31.9)

350 (29.5)

397 (33.5)

1 119 (31.6)

30.9%

  North

205 (17.6)

200 (16.5)

198 (16.7)

603 (17.0)

16.2%

Civil status

n = 1 104

n = 1 109

n = 1 108

n = 3 321

  Single

319 (27.3)

283 (25.5)

311 (28.1)

913 (27.5)

28.7%

  Married/Cohabiting

785 (67.2)

826 (74.5)

797 (71.9)

2408 (72.5)

71.3%

Education

n = 1 168

n = 1 186

n = 1 184

n = 3 538

  ≤High school or vocational school

443 (37.9)

433 (36.5)

448 (37.8)

1 324 (37.4)

61.0%

  ≥Bachelor degree

725 (62.1)

753 (63.5)

736 (62.2)

2 214 (62.6)

39.0%

Born in Norway

n = 1 165

n = 1 183

n = 1 183

n = 3 531

  Yes

1 106 (94.9)

1 127 (95.3)

1 111 (93.9)

3 344 (94.7)

n.a.