Table 3. Diving history and characteristics of combined survey participants; OW − open water; OW+ − post-basic certification other than others listed; Tech − technical diver; DM − divemaster; Inst − instructor; Comm − commercial diver; * hold commercial qualifications but still dive recreationally .
| Group | DAN Members | PADI Members | PADI Divers | P-value |
| Years diving, med (range) | 14 (1−60) | 15 (1−47) | 4 (1−45) | < 0.01 |
| OW only | 34 (4) | NA | 299 (37) | < 0.01 |
| OW+ | 357 (39) | NA | 483 (60) | |
| Tech | 126 (14) | NA | 17 (2) | |
| DM | 203 (22) | 143 (41) | NA | |
| Inst | 160 (17) | 178 (51) | NA | |
| Comm* | 35 (4) | 28 (8) | 6 (<1) | |
| Total dives, med (range) | 330 (4−16,000) | 800 (15−20,000) | 28 (4−10000) | <0.001 |
| Dives past year, med (range) | 30 (0−500) | 50 (2−1000) | 10 (0−200) | <0.001 |
| Time since last dive, months (%) | ||||
| <0.001 | 673 (62) | 208 (60) | 194 (24) | <0.001 |
| 1 to < 6 | 322 (30) | 82 (24) | 267 (33) | |
| 6 to < 12 | 72 (7) | 37 (11) | 270 (34) | |
| ≥ 12 | 19 (2) | 19 (5) | 71 (9) | |
| Dives > 30 m deep (%; med (IQR)) | 10 (3−25) | 10 (5−25) | 1 (0−10) | |
| Repetitive dives (%; med (IQR)) | 80 (40−95) | 80 (50−95) | 80 (38−100) |