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Table 4 Response rates

From: The study of reproductive outcome and the health of offspring of UK veterans of the Gulf war: methods and description of the study population

  GWV NGWV
  No. Crude % Adjusted1 % No. Crude % Adjusted1 %
MEN
TOTAL ELIGIBLE FOR STUDY 51581 (100) - 51688 (100) -
   Died before start of study, or before receipt or completion of questionnaire2 528 (1) - 498 (1) -
   Unable to send (no valid address)3 981 (2) - 1712 (3) -
   Undelivered, returned to sender 4473 (9) - 6042 (12) -
TOTAL ASSUMED DELIVERED 45599 (88) (100) 43436 (84) (100)
   No response 20936 (41) (46) 24540 (48) (57)
   Refused to participate4 284 (1) (1) 457 (1) (1)
COMPLETED QUESTIONNAIRE |5 24379 (47) (53) 18439 (36) (42)
Never tried to have children (% of all Completed forms) 6 5738 (24) - 4187 (23) -
Children / tried to have children (% of all completed forms) 18501 (76) - 14176 (77) -
WOMEN
TOTAL ELIGIBLE FOR STUDY 1230 (100) - 1236 (100) -
   Died before start of study, or before receipt or completion of questionnaire 7 (1) - 12 (1) -
   Unable to send (no valid address)3 90 (7) - 97 (8) -
   Undelivered, returned to sender 150 (12) - 185 (15) -
TOTAL ASSUMED DELIVERED 983 (80) (100) 942 (76) (100)
   No response 273 (22) (28) 355 (29) (38)
   Refused to participate 5 (0.4) (1) 23 (2) (2)
COMPLETED QUESTIONNAIRE* 7 705 (57) (72) 564 (46) (60)
Never tried to have children (% of all Completed forms) 8 312 (44) - 242 (43) -
Children / tried to have children (% of all completed forms) 390 (55) - 320 (57) -
  1. 1Adjusted for undelivered questionnaires and those not sent, i.e. rate among those assumed to have received a questionnaire. 2Subjects identified to us as dead by a relative or other person at the address of the late subject, or by the MoD in regular updates of deaths to 31st March 2001. Includes 4 subjects (1 Gulf, 3 Era) who were too ill to fill the questionnaire in. 3Includes addresses in Northern Ireland and Eire which had not had been confirmed. 4Includes 2 Gulf and 2 Era subjects who subsequently died. 5Includes 55 Gulf and 34 Era subjects who died after completing their form. 6Includes 140 Gulf and 76 Era subjects where questions about children and pregnancies were left blank on the questionnaire. 7Includes 2 Gulf and 1 Era subject who died after completing their form. 8Includes 3 Gulf and 2 Era subjects where questions about children and pregnancies were left blank on the questionnaire