Percentage of non-first births in the five years preceding the survey by number of months since the preceding birth.
Coverage:
Population base: All second- and higher-order births in the time period (BR file or KR file)
Time period: Five years preceding the survey (0-59 months)
Numerator: Number of births whose interval with the preceding birth (b11) is within the specified grouped number of months (7-17, 18-23, 24-35, 36-47, 48-59, 60+)
Denominator: Total number of births
Variables: BR file or KR file.
|
bord |
Birth order |
|
b0 |
Twin |
|
b11 |
Preceding birth interval |
|
b19 |
Months since birth of child (DHS-7) |
|
v005 |
Woman’s individual sample weight |
Covered births: Children both surviving and dead who have a difference between the date of interview and their birth date of 0-59 months (see Notes and Considerations), excluding first-born children and their twins, i.e. excluding birth_order = 1, where birth_order is calculated as follows:
birth_order = bord
if (b0 > 1) birth_order = bord - b0 + 1
Preceding birth interval: (b11) Difference between birth date of child and birth date of preceding child grouped into the groups 7-17, 18-23, 24-35, 36-47, 48-59, and 60+ months. For children of multiple births, the birth date of the preceding child is the number of months since the end of the preceding pregnancy that ended in a live birth.
Numerator divided by the denominator, multiplied by 100.
Not applicable—Birth dates of children are imputed if missing; therefore birth dates do not have missing values.
Percentages add up to 100 percent.
First-order births (and their twins) are excluded from both numerators and denominators.
Births in the month of interview are included and births 60 months before the interview are excluded.
The calculation of months since birth has changed in DHS-7 compared to prior rounds of DHS. In DHS-7 recode files b19 provides months since birth for both living and dead children calculated from the date of birth in days. In prior rounds of The DHS Program, months since birth were calculated based on the date of birth in months as v008-b3. The selection for births in the five years preceding the survey is based on b19 < 60 or, in datasets without b19, v008-b3 < 60.
Similarly, the calculation of the length of the preceding birth interval (b11) also changed in DHS-7 and is now calculated as the difference in the century day code (CDC) for the date of birth (b18) for the index child and the preceding child, in days, divided by 30.4375 to convert to months. In prior rounds of The DHS Program, the preceding birth interval was just the difference in the CMC date of birth of the index child and the preceding child. Overall the preceding birth interval will be a month shorter in roughly half of the cases using the DHS-7 calculation rather than the prior method.
For more information on the changes in the calculation of age of children, months since birth, and the preceding birth interval, see Age of Children in Chapter 1.
DHS-8 Tabulation plan: Table 5.5
API Indicator IDs:
FE_BINT_C_I07, FE_BINT_C_I18, FE_BINT_C_I24, FE_BINT_C_I36, FE_BINT_C_I48, FE_BINT_C_I60
Median number of months since the preceding birth for non-first births in the five years preceding the survey.
Coverage:
Population base: All second- and higher-order births in the time period (BR file or KR file)
Time period: Five years (0-59 months) preceding the survey (b19 < 60)
Median: Interpolated retrospective median
Variables: BR file or KR file.
|
bord |
Birth order |
|
b0 |
Twin |
|
b11 |
Preceding birth interval |
|
b19 |
Months since birth of child |
|
v005 |
Woman’s individual sample weight |
Numerators: Preceding birth interval (b11) in single months. The preceding birth interval is the difference between birth date of child and birth date of preceding child in months. For children of multiple births, the birth date of the preceding child is the number of months since the end of the preceding pregnancy that ended in a live birth.
Denominator: Children both surviving and dead who were born 0-59 months prior to the interview (b19 < 60 – see Changes over Time), excluding first-born children and their twins (see Percent distribution by months since preceding birth).
Numerator for each single month category divided by the denominator, multiplied by 100.
Median is calculated from single month percent distributions of durations of preceding birth intervals. Median is linearly interpolated between the duration month values by which 50 percent or more of the preceding intervals were closed by a birth.
Not applicable—Birth dates of children are imputed if missing; therefore, birth dates do not have missing values.
First-order births (and their twins) are excluded from calculation.
Births in the month of interview are included and births 60 or more months before the interview are excluded.
Since the difference in the index child’s and previous child’s birth dates are truncated to completed months, the difference between them is taken as including up to the next completed month (cumulated percentage for a birth interval with a difference of 21 months actually includes all preceding birth intervals below 22 months). Therefore, an adjustment is made to the interpolated median by increasing the interpolated value by one month as shown in the example above.
See Changes over Time for Percent distribution by months since preceding birth.
DHS-8 Tabulation plan: Table 5.5
API Indicator ID:
FE_BINT_C_MED