Table 7 Intensive tracing survey – response rates among main study non-responders
NON-RESPONDER in main study (ITS-NR) | GWV (men only) | NGWV (men only) | ||||
|---|---|---|---|---|---|---|
| Â | No. | Crude % | Adjusted1 % | No. | Crude % | Adjusted1 % |
TOTAL SELECTED FOR STUDY | 1401 | (100) | - | 1530 | (100) | - |
   Dead | 1 | (0.1) | - | 4 | (0.3) | - |
   Unable to trace | 30 | (2) | - | 41 | (3) | - |
   Undelivered, returned to sender | 54 | (4) | - | 68 | (4) | - |
TOTAL ASSUMED DELIVERED | 1316 | (94) | (100) | 1417 | (93) | (100) |
   No response | 953 | (68) | (72) | 1078 | (70) | (76) |
   Refused to participate2 | 26 | (2) | (2) | 55 | (4) | (4) |
COMPLETED QUESTIONNAIRE 3 | 337 | (24) | (26) | 284 | (19) | (20) |
REPRODUCTIVE HISTORY AT TIME OF SURVEY among responders: | Â | Â | Â | Â | Â | Â |
TOTAL | 337 | (100) | Â | 284 | (100) | Â |
   Never attempted to conceive | 60 | (18) |  | 44 | (15) |  |
   > = 1 conceptions/ attempts to conceive since the Gulf war4 | 168 | (50) |  | 140 | (49) |  |
REASON 5 FOR PREVIOUS NON-RESPONSE among subjects returning shortened form of questionnaire (includes refusals): | Â | Â | Â | Â | Â | Â |
TOTAL | 331 | (100) | Â | 321 | (100) | Â |
   Just never got around to it / thought they had sent it back | 151 | (46) |  | 117 | (36) |  |
   Never tried to have children / all pregnancies before Gulf war | 28 | (8) |  | 8 | (3) |  |
   All children healthy | 0 | (0) |  | 1 | (0.31) |  |
   Did not want reminder of "distressing" events | 3 | (0.9%) |  | 4 | (1.3%) |  |
   Did not serve in the Gulf war / did not have vaccines etc | 3 | (0.9) |  | 20 | (6) |  |
   Other specific reason for non-response, including "mistrust of MOD" | 43 | (13) |  | 30 | (9) |  |
   No reason given (usually returned form blank) | 36 | (11) |  | 56 | (17) |  |
   Did not remember previously being sent a questionnaire | 67 | (20) |  | 84 | (26) |  |