Table 1.
Baseline characteristics of study participants
| Characteristic (N, % unless stated otherwise) | Control (n = 350) | Test-positive (n = 321) | Test-negative (n = 361) | Comparison between groups |
|---|---|---|---|---|
| Study centre | ꭓ 2(2) = 1.23, P = 0.54 | |||
| Glasgow | 255 (72.9) | 235 (73.2) | 275 (76.2) | |
| Tayside | 95 (27.1) | 86 (26.8) | 86 (23.8) | |
| Age | ||||
| 50–54 years | 76 (21.7) | 62 (19.3) | 88 (24.4) | ꭓ 2(8) = 6.11, P = 0.64 |
| 55–59 years | 87 (24.9) | 83 (25.9) | 97 (26.9) | |
| 60–64 years | 80 (22.9) | 62 (19.3) | 72 (19.9) | |
| 65–69 years | 71 (20.3) | 77 (24.0) | 71 (19.7) | |
| 70–75 years | 36 (10.3) | 37 (11.5) | 33 (9.1) | |
| Gender | ꭓ 2(2) = 8.28, P = 0.02 | |||
| Male | 169 (48.3) | 140 (43.6) | 197 (54.6) | |
| Female | 181 (51.7) | 181 (56.4) | 164 (45.4) | |
| Ethnic origin | [0] | [5] | [3] | ꭓ 2(2) = 0.30, P = 0.88 |
| White British | 344 (98.3) | 309 (97.8) | 350 (97.8) | |
| Other | 6 (1.7) | 7 (2.2) | 8 (2.2) | |
| Marital status | [5] | [4] | [6] | ꭓ 2(6) = 5.36, P = 0.50 |
| Single | 43 (12.5) | 25 (7.9) | 38 (10.7) | |
| In a relationship | 23 (6.7) | 28 (8.8) | 32 (9.0) | |
| Married/civil partnership | 175 (50.7) | 172 (54.3) | 183 (51.5) | |
| Other | 104 (30.1) | 92 (29.0) | 102 (28.7) | |
| Scottish Index of Multiple Deprivation | [4] | [0] | [0] | ꭓ 2(8) = 9.40, P = 0.31 |
| 1 (most deprived) | 152 (43.9) | 124 (38.6) | 154 (42.7) | |
| 2 | 60 (17.3) | 82 (25.5) | 64 (17.7) | |
| 3 | 49 (14.2) | 45 (14.0) | 57 (15.8) | |
| 4 | 48 (13.9) | 41 (12.8) | 50 (13.9) | |
| 5 (least deprived | 37 (10.7) | 29 (9.0) | 36 (10.0) | |
| Age on leaving full-time education (years) | [9] | [10] | [9] | ꭓ 2(2) = 0.43, P = 0.81 |
| Median (IQR) | 16.00 (1) | 16.00 (1) | 16.00 (1) | |
| Employment status | [7] | [6] | [6] | ꭓ2(6) = 5.78, P = 0.45 |
| Paid employment | 115 (33.5) | 119 (37.8) | 144 (40.6) | |
| Unable to work due to illness/disability | 54 (15.7) | 46 (14.6) | 52 (14.6) | |
| Unemployed and looking for work | 16 (4.7) | 10 (3.2) | 18 (5.1) | |
| Other | 158 (46.1) | 140 (44.4) | 141 (39.7) | |
| Smoking status | ꭓ 2(2) = 4.49, P = 0.11 | |||
| Smoker | 189 (54.0) | 165 (51.4) | 214 (59.3) | |
| Ex-smoker | 161 (46.0) | 156 (48.6) | 147 (40.7) | |
| Pack year history—median (IQR) | 35.00 (21) | 33.00 (23) | 35.00 (22) | ꭓ 2(2) = 1.36, P = 0.51 |
| First-degree relative with lung cancer | ꭓ 2(2) = 2.25, P = 0.33 | |||
| Yes | 87 (24.9) | 95 (29.6) | 92 (25.5) | |
| No | 263 (75.1) | 226 (70.4) | 269 (74.5) | |
| PANAS positive | [31] | [33] | [40] | ꭓ 2(2) = 2.39, P = 0.30 |
| Median (IQR) | 34.00 (11) | 35.00 (13) | 34.00 (10) | |
| PANAS negative | [25] | [23] | [22] | ꭓ 2(2) = 0.66, P = 0.72 |
| Median (IQR) | 13.00 (7) | 13.00 (6) | 14.00 (7) | |
| LCWS—frequency of worry | [1] | [4] | [1] | ꭓ 2(2) = 2.63, P = 0.27 |
| Not worried | 131 (37.5) | 138 (43.5) | 150 (41.7) | |
| Worried | 218 (62.5) | 179 (55.8) | 210 (58.3) | |
| LCWS—impact of worry | [4] | [4] | [3] | ꭓ 2(2) = 2.76, P = 0.25 |
| Median (IQR) | 2.00 (1) | 2.00 (1) | 3.00 (1) | |
| LCWS—worry about tests | [3] | [4] | [0] | ꭓ 2(2) = 1.95, P = 0.38 |
| Not anxious | 314 (90.5) | 291 (91.8) | 320 (88.6) | |
| Anxious | 33 (9.5) | 26 (8.2) | 41 (11.4) | |
[] missing values. IQR = interquartile range.