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Table 7 Intensive tracing survey – response rates among main study non-responders

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

NON-RESPONDER in main study (ITS-NR) GWV (men only) NGWV (men only)
  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:       
TOTAL 337 (100)   284 (100)  
   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):       
TOTAL 331 (100)   321 (100)  
   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)  
  1. 1Adjusted for undelivered questionnaires and those not sent, i.e. rate among those assumed to have received a questionnaire, or reached by telephone. 2No subjects reached by telephone refused to participate. 3Response rate 100% for subjects reached by telephone (6 GWV, 14 NGWV among ITS-UN; 23 GWV, 31 NGWV among ITS-NR). 4After first deployment to the Gulf (GWV) or after 1st January 1991 among NGWV or where Gulf deployment dates not known. 5Subjects were asked to give a reason in free text.