A hypothetical example of calculating the WPP-adjusted incidence rate of road traffic disabilities among women between 20 and 49 years of age in 1981
| AGP | i |  |  | AGRSP |  |  |  |  |  |
|---|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
| 20–24 | 1 | 0.90 | 0.95 | 0.01 | 0.91 | 10.00 | 29.24 | 650 000 | 4.50 |
| 25–29 | 2 | 0.85 | 0.88 | 0.01 | 0.86 | 12.00 | 48.37 | 700 000 | 6.91 |
| 30–34 | 3 | 0.80 | 0.85 | 0.01 | 0.81 | 15.00 | 85.24 | 750 000 | 11.37 |
| 35–39 | 4 | 0.75 | 0.80 | 0.01 | 0.76 | 17.00 | 139.74 | 800 000 | 17.47 |
| 40–44 | 5 | 0.70 | 0.75 | 0.01 | 0.71 | 18.00 | 220.49 | 850 000 | 25.94 |
| 45–49 | 6 | 0.65 | 0.70 | 0.01 | 0.66 | 20.00 | 386.53 | 900 000 | 42.95 |
| Total |  |  |  |
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Notes: column heading specification:
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(1) AGP: the WPP-defined age groups.
-
(2) i: the ith AGP.
-
(3)
: age-specific survival probability in 1980 derived from the WPP life table. -
(4)
: age-specific survival probability in 1985 derived from the WPP life table. -
(5) AGRSP: annual average growth rate of age-specific survival probability from 1980 to 1985, that is,
. -
(6)
: age-specific survival probability in 1981, that is, . -
(7)
: number of survived persons in the ith age group with RTDs occurred in year of 1981 and survived for 25 years. -
(8)
: estimated incident number of persons in the ith age group with RTDs occurred in year of 1981 after adjusted for early life loss during 1981–2006. For example, for the first age group of 20–24, we have . -
: total annual number of people with RTDs.
-
(9)
: weighted population in each age group in 1981. -
: weighted total number of population in 1981.
-
(10)
: the estimated incidence rate of RTDs (per 100 000) in the ith age group in 1981, that is, -
.
-
In the last row, we calculate the estimated incidence rate of RTDs (per 100 000) in 1981 with
-
.
-
RTD, road traffic disability; WPP, World Population Prospects.
