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Table 2 Responders at 3 months

From: The effect of postal questionnaire burden on response rate and answer patterns following admission to intensive care: a randomised controlled trial

 

Group A (n = 2466)

Group B (n = 2315)

p

All (n = 4781)

Age median, [IQR]

65 [53–74]

65 [53–74]

0.99c

65 [53–74]

Male sex (%)

57%

57%

0.87b

57%

APACHE II score median, [IQR]

15 [11–19]

14 [11–19]

0.08a

15 [11–19]

ICU length of stay days median [IQR]

3 [2–6]

3 [2–6]

0.33a

3 [2–6]

Hospital length of stay days median [IQR]

15 [9–26]

15 [8–25]

0.23a

15 [8–25]

Reason for ICU admission n (%)

    

Respiratory tract infection

237 (10)

192 (8)

0.16b

429 (9)

Major vascular procedure

185 (8)

171 (7)

0.93b

356 (7)

Large bowel tumour

148 (6)

173 (7)

0.07b

321 (7)

Acute renal failure

109 (4)

90 (4)

0.42b

199 (4)

Chronic obstructive pulmonary disease

79 (3)

76 (3)

0.95b

155 (3)

Bowel perforation

66 (3)

47 (2)

0.18b

113 (2)

Septicaemia/septic shock

60 (2)

61 (3)

0.73b

121 (3)

Oesophageal neoplasm

56 (2)

70 (3)

0.14b

126 (3)

Status epilepticus

52 (2)

44 (2)

0.69b

96 (2)

Self-poisoning

44 (2)

53 (2)

0.27b

97 (2)

Not recorded

77 (3)

64 (3)

0.53b

141 (3)

Other

1353 (55)

1274 (55)

 

2627 (55)

Self-reported demographics n (%)

    

Current address

Usual address

2305 (93)

2165 (94)

 

4470 (93)

 

Family

36 (1)

38 (2)

 

74 (2)

 

Rehabilitation

19 (1)

11 (0)

 

30 (1)

 

Other

36 (1)

38 (2)

 

74 (2)

 

Not usual (unspecified)

13 (1)

10 (0)

 

23 (0)

 

Missing

57 (2)

53 (2)

0.79b

110 (2)

Higher education

Yes

985 (40)

983 (42)

 

1968 (41)

 

No

1235 (50)

1138 (49)

 

2373 (50)

 

Missing

246 (10)

194 (8)

0.07b

440 (9)

University degree

Yes

580 (24)

600 (26)

 

1180 (25)

 

No

1700 (69)

1579 (68)

 

3279 (69)

 

Missing

186 (8)

136 (6)

0.02b

322 (7)

Current employment status

Full time

245 (10)

213 (9)

 

458 (10)

 

Part time

108 (4)

129 (6)

 

237 (5)

 

Seeking

27 (1)

35 (2)

 

62 (1)

 

Retired

1353 (55)

1250 (54)

 

2603 (54)

 

Sick

380 (15)

376 (16)

 

756 (16)

 

Housework

120 (5)

110 (5)

 

230 (5)

 

Student

24 (1)

17 (1)

 

41 (1)

 

Other

112 (5)

97 (4)

 

209 (4)

 

Missing

97 (4)

88 (4)

0.47b

185 (4)

Prior employment status

Full time

437 (18)

388 (17)

 

825 (17)

 

Part time

189 (8)

190 (8)

 

379 (8)

 

Seeking

38 (2)

24 (1)

 

62 (1)

 

Retired

1233 (50)

1170 (51)

 

2403 (50)

 

Sick

168 (7)

169 (7)

 

337 (7)

 

Housework

132 (5)

105 (5)

 

237 (5)

 

Student

27 (1)

16 (1)

 

43 (1)

 

Other

75 (3)

87 (4)

 

162 (3)

 

Missing

167 (7)

166 (7)

0.28b

333 (7)

Carer now

Yes

150 (6)

152 (7)

 

302 (6)

 

No

2207 (89)

2052 (89)

 

4259 (89)

 

Missing

109 (4)

111 (5)

0.64b

220 (5)

Carer prior

Yes

159 (6)

170 (7)

 

329 (7)

 

No

1844 (75)

1680 (73)

 

3524 (74)

 

Missing

463 (19)

465 (20)

0.2b

928 (19)

Assistance

Answered

246 (10)

288 (12)

 

534 (11)

 

Unable

68 (3)

42 (2)

 

110 (2)

 

Unspecified

21 (1)

26 (1)

 

47 (1)

 

No

2050 (83)

1893 (82)

 

3943 (82)

 

Missing

81 (3)

66 (3)

0.01b

147 (3)

Mental problems now

Yes

334 (14)

298 (13)

 

632 (13)

 

No

2034 (82)

1912 (83)

 

3946 (83)

 

Missing

98 (4)

105 (5)

0.52b

203 (4)

Mental problems prior

Yes

354 (14)

331 (14)

 

685 (14)

 

No

1730 (70)

1636 (71)

 

3366 (70)

 

Missing

382 (15)

348 (15)

0.9b

730 (15)

  1. n (%), median [interquartile range]
  2. p values not corrected for multiple testing
  3. aMann-Whitney U test (non-parametric)
  4. bChi-squared test
  5. cWelch’s t-test