Table 1

Attrition at short-term follow-up: comparison of T1 questionnaire completers and non-completers

T1 completers (n=3232)*
n (%) or mean (SD)		T1 non-completers (n=749)*
n (%) or mean (SD)		Test statistic
(p value)
Trial allocation
 Intervention1653 (51)312 (42)<0.001
 Control1579 (49)437 (58)
Site
 Liverpool recruitment centre1585 (49)420 (56)<0.001
 Cambridge recruitment centre1647 (51)329 (44)
Age (years)67.73 (3.98)67.28 (4.46)<0.01
Gender
 Male2446 (76)533 (71)<0.01
 Female786 (24)216 (29)
Education†
 Up to GCSE/O level1007 (43)334 (57)<0.001
 Beyond GCSE/O level1310 (57)250 (43)
Ethnicity
 White3190 (99)739 (99)‡
 Non-white26 (1)10 (1)
Marital group
 Married/cohabiting2410 (75)508 (68)<0.001
 Not married/cohabiting814 (25)240 (32)
IMD
 Quintile 1 (most deprived)843 (26)222 (30)<0.001
 Quintile 2367 (11)109 (15)
 Quintile 3574 (18)135 (18)
 Quintile 4578 (18)141 (19)
 Quintile 5 (least deprived)870 (27)142 (19)
Smoking status
 Current smoker1194 (37)338 (45)<0.001
 Ex-smoker2037 (63)410 (55)
 Never smoker1 (<1)1 (<1)‡
Experience of lung cancer (T0)
 No1870 (58)396 (53)<0.01
 Yes1355 (42)352 (47)
Cancer distress (T0)§2.16 (0.28)
8.65		2.21 (0.31)
9.16		<0.001
Anxiety (T0)§1.52 (0.71)
3.59		1.65 (0.71)
4.20		<0.001
Depression (T0)§1.27 (0.67)
2.56		1.37 (0.66)
2.94		<0.001
Decision satisfaction (T0)
 Not very satisfied1916 (59)428 (57)0.32
 Very satisfied1308 (41)317 (43)

  • *Ns vary in each cell due to missing data. Percentages were calculated based on available data.

  • †A substantial amount of data were missing or uninformative for education.

  • ‡Data were excluded from analysis due to limited variation.

  • §Logn scores are provided in normal text and original scale scores are provided in italics (analyses performed using logn scores).

  • GCSE, General Certificate of Secondary Education; IMD, Index of Multiple Deprivation.