TABLE 3-5 Annual Number and Rates of Poisoning Outpatient/Clinic Visits Confirmed by ICD-9-CM Codes, National Hospital Ambulatory Medical Care Survey (NHAMCS) Outpatient File, 1997–2001

 

Sample Number

Number of Poisoning Visits (thousands)

 

Total Population (millions)a

Visits per 100,000 Persons per Annum

Total

315

163

 

271.56

60

Gender

Male

152

81

 

132.52

60

Female

163

82

 

139.05

60

Age

Under 18

93

43

 

72.02

60

18–64

190

98

 

167.09

60

65 and over

32

22

 

32.45

70

Race

White

237

123

 

215.97

60

Black

66

36

 

33.11

110

Other

12

4b

 

21.91

20b

Region

Northeast

77

40

 

52.44

80

Midwest

68

44

 

66.46

70

South

100

49

 

96.68

50

West

70

30

 

55.99

50

Reason/symptoms included poisoning (percentage)

37

16

(10)

271.56

10

Poison E-code included (percentage)

204

95

(59)

271.56

40

Poison diagnosis code included (percentage)

174

106

(65)

271.56

40

aEstimated from NHIS 1997–2001 person files.

bEstimate has low statistical reliability (relative standard error >30 percent or sample N <30).

NOTE: NHAMCS is an annual survey of hospitals with outpatient and emergency departments that record visits over a 4-week period.

SOURCE: Cisternas (2003).

gest a lower discounting rate to convert these poisoning visits into incident episodes compared with NAMCS, where follow-up visits formed a larger proportion of the sample. The disposition data for the 1999–2001 period indicated that an estimated 15 percent of visits in that period had a follow-up visit planned, and 25 of the 197 visits in the sample (population estimate 9,300 out of 150,000 or 6 percent) for that period were to be admitted to a hospital.



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