Table 1.
Characteristics of participants included in the current study (n = 775, 267 cases, 508 controls).
| Case (n = 267) | Control (n = 508) | P | |
|---|---|---|---|
| Sex, n (%) | |||
| Male | 113 (23.2) | 62 (22.2) | 0.757 |
| Female | 395 (76.8) | 205 (77.8) | |
| Age in years, median (IQR) | 38.5 (14.7) | 39.8 (15.1) | 0.123 |
| Study region, n (%) | |||
| Brisbane (27 °S) | 90 (33.7) | 176 (34.6) | 0.089 |
| Newcastle (33 °S) | 35 (13.1) | 88 (17.3) | |
| Geelong (37 °S) | 64 (24) | 134 (26.4) | |
| Tasmania (43 °S) | 78 (29.2) | 110 (21.7) | |
| Education, n (%) | |||
| Year 10 or below | 66 (24.8) | 165 (32.5) | 0.065 |
| Year 11 or 12 | 53 (19.9) | 73 (14.4) | |
| TAFE/Diploma | 80 (30.1) | 139 (27.4) | |
| University | 67 (25.2) | 131 (25.8) | |
| Smoking history, n (%) | |||
| Smoked at some time | 163 (61.3) | 266 (52.5) | 0.019 |
| Never smoked | 103 (38.7) | 241 (47.5) | |
| Body mass index, median (IQR) | 25.9 (7.6) | 25.7 (7.4) | 0.848 |
| Physical activity (METs), median (IQR) | 2034 (3639) | 1940 (3137) | 0.596 |
| History of infectious mononucleosis, n (%) | |||
| Yes | 73 (27.4) | 83 (16.3) | <0.0001 |
| No | 175 (65.8) | 404 (79.5) | |
| Do not know | 18 (6.8) | 21 (4.1) | |
| Dietary misreporting, n (%) | |||
| Under-reporter | 73 (27.4) | 176 (22) | 0.091 |
| Normal/over-reporter | 193 (72.6) | 394 (78) | |
| Ultra-processed foods (servings/day), median (IQR) | 6.2 (4.3) | 5.5 (4.4) | 0.889 |
IQR interquartile range, TAFE Technical and Further Education, SD standard deviation; MET metabolic equivalent of task.
The following variables had missing data: education (1 case); smoking history (1 case, 1 control); body mass index (1 case, 3 controls); history of infectious mononucleosis (1 case); dietary misreporting (1 case, 3 controls).