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Long-Term Health Effects of Participation in Project SHAD (Shipboard Hazard and Defense) (2007) / Chapter Skim
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7 Health Survey
Pages 24-32

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From page 24...
... Two important limitations can result in biased findings. First, a low response rate could produce biased prevalence estimates of specific conditions, as well as introduce bias into comparisons between participant and control groups depending on the nature of the nonresponse.
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From page 25...
... This allowed us to update addresses from multiple sources, as well. USING FEDEX DELIVERY TO CHECK THE QUALITY OF SURVEY ADDRESSES After several months of data collection, there was still a high proportion of study subjects who had not responded to either a mail questionnaire or an attempted telephone interview.
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From page 26...
... Finally, out of the total of 400 attempted deliveries, there were a total of 50 questionnaire responses sent by returned mail and 30 subsequently completed telephone interviews. This gives an overall response rate of 20 percent to the FedEx mailing.
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From page 27...
... FINAL SURVEY RESPONSE RATES Table 7-3 shows the distribution of several demographic characteristics for all participants and controls, as well as respondent participants and controls. Compared with Project SHAD participants, controls had fewer nonwhites and fewer officers.
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From page 28...
... Neither age nor race had a statistically significant association with response, but the remaining variables were all statistically associated with response rate. Compared with officers, both E1–E3 and E4–E8 pay grades had significantly higher odds of responding, while Marines subjects had significantly lower odds of responding than Navy subjects.
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From page 29...
... Neither average physical component score nor mental component score show any substantial trends over time, which is welcome news. COMPARISON OF MAIL QUESTIONNAIRE VERSUS TELEPHONE INTERVIEW RESPONSES Although we attempted to translate the mail questionnaire as closely as possible into a telephone interview format, we were aware that there could be differences in responses between the two data collection modes.
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From page 30...
... FIGURE 7-1 Mean summary SF-36 scores by month of telephone interview. TABLE 7-6 Comparison of Mail Questionnaire Versus Telephone Interview Respondents for Selected Characteristics by Percentage Distribution fig 7-1 Characteristic Mail Questionnaire Respondents Telephone Interview Respondents Project SHAD participation Participant 52.6% 51.1% Control 47.4% 48.9% Current age 55–64 70.9%*
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From page 31...
... (N = 4,324) Exposure Groupa A 39.3% 22.7% 31.4% 19.7% B 45.1% 27.9% 30.0% 25.6% C 46.6% 22.0% 33.4% 21.6% D 36.7% 38.6% 30.3% 20.9% Selected Diagnoses Infectious disease 8.6% 5.6% 7.4% 5.3% Cancer 12.1% 7.8% 9.1% 6.9% Endocrine disease 27.8% 13.8% 22.0% 13.2% Mental disorder 18.9% 11.6% 15.4% 11.2% Circulatory disease 28.1% 16.1% 22.9% 14.6% Respiratory disease 17.0% 10.2% 13.3% 9.4% Digestive disease 19.0% 11.4% 14.7% 10.4% Genitourinary disease 14.6% 7.7% 12.0% 7.4% Skin disease 14.7% 8.2% 11.5% 7.5% Musculoskeletal disease 21.6% 12.4% 18.7% 11.9% Ill-defined disease 23.9% 14.1% 18.5% 13.7% Injury 9.9% 6.8% 9.0% 6.2% Branch Navy 39.4% 21.8% 31.2% 20.2% Marines 52.9% 34.5% 35.1% 26.9% Paycode E1–E3 41.8% 26.7% 31.1% 22.8% E4–E8 40.0% 20.8% 31.5% 21.8% Officerb 36.1% 16.4% 35.2% 6.7% Total 40.6% 23.3% 31.4% 21.1% aGroup A = participants potentially exposed only to BG or MAA; group B = participants potentially exposed only to TOF; group C = participants potentially exposed to any active chemical or biological agent; group D = participants potentially exposed only to simulants and not in groups A or B
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From page 32...
... 2002. Clinical evaluation of veterans involved in Project 112 and related Project SHAD tests (VHA Directive 2002-079)
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Key Terms

  • telephone interview
  • health survey
  • participants potentially
  • mail questionnaire
  • potentially exposed

  • study subjects
  • response rate
  • possibly exposed
  • response rates
  • interview respondents

  • active agents
  • fedex delivery
  • active chemical
  • versus telephone
  • subjects possibly

  • participation status
  • component score
  • contact letters
  • shad participants
  • low response

  • shad participant
  • telephone interviewing
  • questionnaire respondents
  • response status
  • cohort study

  • initial mailing
  • delivery rates
  • mental component
  • biological agents
  • physical component


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