# Analysis of Children's Health Insurance Patterns: Findings from the SIPP. D. Annual Incidence and Duration of Uninsurance, Medicaid Eligibility, and Medicaid Participation by Age

When we measure age at a point in time but measure behavior over a period of time, some of the behavior that we observe may have happened at an earlier or later age. If the behavior in question is affected by crossing particular age boundaries--as is Medicaid participation--then the relationship that we observe between age and the measured behavior may be attenuated by defining age at a point in time. Tables 24 through 27 are based on a different approach to assigning age to behavior measured over time. These tables examine the experience of uninsurance, Medicaid participation, and both Medicaid-eligible and Medicaid-ineligible periods of uninsurance through the 12 months that a child spends at a given single year of age. To create these tables, we identified children by their age in September 1993 and then looked forward and backward to determine the 12-month period that each child spent at the defined age.11 We then counted the number of months over this 12-month period that each child was observed in each of four statuses: uninsured (Table 24), uninsured but eligible for Medicaid (Table 25), uninsured but not eligible for Medicaid (Table 26), and enrolled in Medicaid (Table 27). For each of these four statuses we tabulated by single year of age:

• The proportion of children who experienced any months in that status during the year
• The mean number of months in that status among those who spent 1 to 12 months
• The proportion who were in that status for all 12 months, expressed as
(1) a proportion of children who spent any time in that status during the year,
(2) a proportion of all children
TABLE 24: ANNUAL FREQUENCY OF UNINSURANCE BY SINGLE YEAR OF AGE
Age of Child in September 1993 Number of Children Children Ever Uninsured
Percentage Ever Uninsured Average Number of Months Uninsured Percentage Uninsured All 12 Months Percentage of All Children Uninsured 12 Months
All Children 70,868,000 21.7 7.01 29.1 6.3
0 3,469,000 16.4 4.87 9.6 1.6
1 3,008,000 18.4 6.39 21.9 4
2 4,558,000 19.7 6.7 25.4 5
3 4,043,000 18.5 6.21 19.9 3.7
4 4,004,000 20.3 6.49 22.5 4.6
5 3,867,000 19.8 6.81 30.2 6
6 3,993,000 21.9 6.47 21.7 4.8
7 3,607,000 19.3 6.6 24.7 4.8
8 3,841,000 20.9 6.74 29.7 6.2
9 3,532,000 21.7 7.17 28.7 6.2
10 3,785,000 22.2 7.05 29.6 6.6
11 3,742,000 23.9 7.45 32.7 7.8
12 3,931,000 23.4 6.67 26.9 6.3
13 3,906,000 23 8.28 39.1 9
14 3,461,000 21 7.9 35 7.4
15 3,376,000 23.8 7.63 37.8 9
16 3,578,000 25.3 7.55 38 9.6
17 3,678,000 25.9 7.33 29.8 7.7
18 3,490,000 26.9 7.73 38.1 10.2

SOURCE: Survey of Income and Program Participation, 1992 Panel.

NOTE: Incidence and frequency of uninsurance were observed over the entire 12 months that
a child spent at the indicated age.

TABLE 25: ANNUAL FREQUENCY OF UNINSURANCE WITH MEDICAID ELIGIBILITY BY SINGLE YEAR OF AGE
Age of Child in September 1993 Number of Children Percentage Ever Uninsured and Medicaid- Eligible Children Ever Uninsured and Medicaid-Eligible Percentage of All Children Uninsured and Eligible 12 Months
Average Number of Months Percentage Uninsured and Eligible 12 Months
All Children 70,868,000 10.7 4.78 9 1
0 3,469,000 13 4.22 5.5 0.7
1 3,008,000 12.7 5.36 11.1 1.4
2 4,558,000 14.1 5.4 9.4 1.3
3 4,043,000 12.7 5.41 9.8 1.2
4 4,004,000 14.7 4.56 6.9 1
5 3,867,000 15.3 5.4 12.3 1.9
6 3,993,000 13.9 3.94 2.3 0.3
7 3,607,000 10.5 4.74 7.1 0.7
8 3,841,000 12.1 5.29 11.3 1.4
9 3,532,000 13 4.89 7.6 1
10 3,785,000 7.3 4.08 6.2 0.5
11 3,742,000 8.5 3.86 5.6 0.5
12 3,931,000 7.3 3.86 8.1 0.6
13 3,906,000 8.1 4.24 11.8 1
14 3,461,000 7.1 6.77 22.2 1.6
15 3,376,000 9.5 4.09 4.1 0.4
16 3,578,000 7.7 4.69 10.6 0.8
17 3,678,000 7.6 4.01 6.9 0.5
18 3,490,000 6.4 5.68 24.7 1.6

SOURCE: Survey of Income and Program Participation, 1992 Panel.

NOTE: Incidence and frequency of uninsurance were observed over the entire 12 months that
a child spent at the indicated age.

TABLE 26: ANNUAL FREQUENCY OF UNINSURANCE WITHOUT MEDICAID ELIGIBILITYBY SINGLE YEAR OF AGE
Age of Child in September 1993 Number of Children Percentage  Ever Uninsured and Not Medicaid- Eligible Children Ever Uninsured and Not Medicaid-Eligible

Percentage of All Children Uninsured and Ineligible 12 Months
Average Number of Months Percentage Uninsured and Ineligible 12 Months
All Children 70868000 16.3 6.19 20.1 3.3
0 3469000 6 4.1 5 0.3
1 3008000 11.6 4.27 1.5 0.2
2 4558000 10.6 5.27 12.2 1.3
3 4043000 11.8 3.91 4.4 0.5
4 4004000 12.2 5.33 14.7 1.8
5 3867000 11.6 4.48 10.4 1.2
6 3993000 15.3 5.69 12.6 1.9
7 3607000 14 5.52 12.6 1.8
8 3841000 13.9 5.52 14.8 2.1
9 3532000 17.1 5.39 11 1.9
10 3785000 19.6 6.46 24.2 4.7
11 3742000 20.4 7.12 30.1 6.2
12 3931000 20 6.4 23.6 4.7
13 3906000 20.2 7.72 29.6 6
14 3461000 17.1 6.91 23.7 4.1
15 3376000 19.8 7.19 31.4 6.2
16 3578000 22.9 6.77 26.3 6
17 3678000 23.4 6.8 19.1 4.5
18 3490000 23.7 7.26 32.5 7.7

SOURCE: Survey of Income and Program Participation, 1992 Panel.

NOTE: Incidence and frequency of uninsurance were observed over the entire 12 months that
a child spent at the indicated age.

TABLE 27: ANNUAL FREQUENCY OF MEDICAID COVERAGE BY SINGLE YEAR OF AGE
Age of Child in September 1993 Number of Children Percentage Ever Covered by Medicaid Children Ever Covered by Medicaid Percentage of All Children Covered for All 12 Months
Average Number of Months Percentage Covered for All 12 Months
All Children 70868000 24.2 9.21 55.1 13.3
0 3469000 39.2 10.28 63.6 24.9
1 3008000 34.7 9.61 61.5 21.3
2 4558000 35.4 9.67 62.7 22.2
3 4043000 29.4 9.41 60.8 17.8
4 4004000 27.8 9.52 53.5 14.8
5 3867000 28.4 9.95 65.2 18.5
6 3993000 30.3 8.97 50.5 15.3
7 3607000 21.5 9.55 58.9 12.7
8 3841000 22.2 9.54 60.7 13.5
9 3532000 24.8 8.83 52.6 13
10 3785000 20.9 8.79 49.8 10.4
11 3742000 20.9 8.81 51.4 10.7
12 3931000 19.5 8.47 45.4 8.9
13 3906000 20.3 8.84 55.6 11.3
14 3461000 19 8.23 44.6 8.5
15 3376000 17.1 8.81 47.5 8.1
16 3578000 15.2 8.91 48.3 7.3
17 3678000 19.3 8.04 42.4 8.2
18 3490000 12.2 7.98 33.4 4.1

SOURCE: Survey of Income and Program Participation, 1992 Panel.

NOTE: Incidence and frequency of Medicaid coverage were observed over the entire 12 months that a child spent at the indicated age.

These tabulations give us a clearer picture of the age-specific patterns of uninsurance and Medicaid participation than we obtain when we classify children's behavior over the course of a year by their age at the beginning or end of that year.

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