Appendix E
Results from Alternative Analyses of Data on Reports of Audiometric Testing in Service Medical Records

Chapter 6 reports the results of a review of service medical records to assess the availability of audiometric test records dating from a service member’s entry into and separation from military service. The analysis reported in Chapter 6 used a ±60-day window around entry and separation dates to determine the percentage of service medical records in which these audiometric records were present. To assess the effect of the ±60-day window, an alternative analysis was conducted using a ±120-day window. The results of that alternative analysis are shown below.

TABLE E-1 Percentages of Service Medical Records (95% Confidence Intervals) with Reports of Audiometric Examinations Within 120 Days of Entry into Active Duty (n = 3,212)

Branch

Before 1950

1950–1969

1970–Regulation Date

Regulation Date–1993

1994–2002

Army

1 (0–2)

10 (5–14)

45 (39–52)

42 (36–49)

54 (48–60)

Air Force

*

27 (17–37)

43 (36–50)

43 (37–50)

43 (36–50)

Marine Corps

0

17 (7–28)

48 (41–56)

62 (55–69)

76 (71–82)

Navy

1 (0–4)

11 (5–17)

48 (41–55)

66 (59–72)

76 (71–81)

*Fewer than 40 records in denominator.

NOTE: The time periods reflect the era of the service member’s release from active duty.



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OCR for page 299
Noise and Military Service: Implications for Hearing Loss and Tinnitus Appendix E Results from Alternative Analyses of Data on Reports of Audiometric Testing in Service Medical Records Chapter 6 reports the results of a review of service medical records to assess the availability of audiometric test records dating from a service member’s entry into and separation from military service. The analysis reported in Chapter 6 used a ±60-day window around entry and separation dates to determine the percentage of service medical records in which these audiometric records were present. To assess the effect of the ±60-day window, an alternative analysis was conducted using a ±120-day window. The results of that alternative analysis are shown below. TABLE E-1 Percentages of Service Medical Records (95% Confidence Intervals) with Reports of Audiometric Examinations Within 120 Days of Entry into Active Duty (n = 3,212) Branch Before 1950 1950–1969 1970–Regulation Date Regulation Date–1993 1994–2002 Army 1 (0–2) 10 (5–14) 45 (39–52) 42 (36–49) 54 (48–60) Air Force * 27 (17–37) 43 (36–50) 43 (37–50) 43 (36–50) Marine Corps 0 17 (7–28) 48 (41–56) 62 (55–69) 76 (71–82) Navy 1 (0–4) 11 (5–17) 48 (41–55) 66 (59–72) 76 (71–81) *Fewer than 40 records in denominator. NOTE: The time periods reflect the era of the service member’s release from active duty.

OCR for page 299
Noise and Military Service: Implications for Hearing Loss and Tinnitus TABLE E-2 Percentages of Service Medical Records (95% Confidence Intervals) with Reports of Audiometric Examinations Within 120 Days of Release from Active Duty (n = 3,226) Branch Before 1950 1950–1969 1970–Regulation Date Regulation Date–1993 1994–2002 Army 3 (0–6) 16 (10–21) 52 (45–59) 47 (40–54) 34 (28–40) Air Force * 41 (30–51) 49 (42–56) 38 (31–45) 17 (12–22) Marine Corps 0 4 (0–9) 65 (57–72) 69 (62–76) 60 (54–66) Navy 0 11 (5–17) 61 (54–68) 67 (61–74) 66 (61–72)   *Fewer than 40 records in the denominator. TABLE E-3 Percentages of Service Medical Records (95% Confidence Intervals) with Reports of Audiometric Examinations Within 120 Days of Entrance into and Release from Active Duty (n = 3,210) Branch Before 1950 1950–1969 1970–Regulation Date Regulation Date–1993 1994–2002 Army 1 (0–2) 7 (3–11) 28 (22–34) 22 (16–27) 19 (14–23) Air Force * 23 (14–33) 25 (19–31) 16 (11–21) 9 (5–13) Marine Corps 0 2 (0–6) 38 (31–45) 44 (37–51) 51 (45–57) Navy 0 2 (0–5) 33 (26–40) 46 (39–53) 52 (46–58) *Fewer than 40 records in the denominator. NOTE: The time periods reflect the era of the service member’s release from active duty.