Characteristics of participants
| All participants | Primary screening only | Primary and secondary screening | |
| N=544 | N=130 | N=414 | |
| Sex, n (column %) | |||
| Male | 514 (94.5) | 113 (86.9) | 401 (96.9) |
| Age (years), median (P25–P75) | 36.2 (28.9–45.6) | 31.1 (25.0–39.2) | 38.1 (30.1–46.7) |
| BMI* (kg/m2), mean (SD) | 27.4 (5.5) | 26.3 (5.1) | 27.7 (5.5) |
| Smoking history, n (column %) | |||
| Never | 240 (44.1) | 85 (65.4) | 155 (37.4) |
| Former | 112 (20.6) | 12 (9.2) | 100 (24.2) |
| Current | 192 (35.3) | 33 (25.4) | 159 (38.4) |
| Place of birth, n (column %) | |||
| Australia | 268 (49.3) | 56 (43.1) | 212 (51.2) |
| Asia | 181 (33.3) | 55 (42.3) | 126 (30.4) |
| Europe | 47 (8.6) | 5 (3.8) | 42 (10.1) |
| Other | 32 (5.9) | 8 (6.2) | 24 (5.8) |
| Unspecified | 16 (2.9) | 6 (4.6) | 10 (2.4) |
| SBI career duration (years) | |||
| Median (P25–P75) | 7 (3–14) | 2 (1–3) | 10 (5–15) |
| Range (min–max) | <1–44 | <1–24 | <1–44 |
| Time since first SBI job (years) | |||
| Median (IQR) | 8 (3–14) | 2 (1–3) | 10 (6–16) |
| Age at first SBI job (years) | |||
| Median (P25-P75) | 26 (20–33) | 29 (23–36) | 25 (20–33) |
| Range (min–max) | 13–59 | 15–59 | 13–59 |
| Total no of SBI workplaces reported, median (IQR) | |||
| Median (P25–P75) | 1 (1–3) | 1 (1–1) | 2 (1–3) |
| Range (min–max) | 1–30 | 1–8 | 1–30 |
| Rose dyspnoea score† (column %) | |||
| 0 | 402 (74.0) | 123 (94.6) | 279 (67.6) |
| 1 | 90 (16.6) | 6 (4.6) | 84 (20.3) |
| 2 | 31 (5.7) | 1 (0.8) | 30 (7.3) |
| 3 | 20 (3.7) | 0 (0.0) | 20 (4.8) |
*Missing data: BMI – 5.
†Modified Rose dyspnoea score 0–3.
BMI, body mass index; P25, 25th percentile; P75, 75th percentile; SBI, stone benchtop industry.