6. MORTALITY AND HEALTH6.1 MortalityIn the O<strong>DHS</strong>, mortality data were collected primarily for the purpose of estimating infant andchild mortality rates. In this section mortality rates are calculated, using direct estimation procedures, for:Infant mortality, the probability of dying between birth and exact age one;Child mortality, the probability of dying between age one and exact age five;Under five mortality, the probability of dying between birth and exact age five.Rates are calculated on a period basis (i.e., utilizing infonnation on deaths and exposure tomortality during a specific time period) rather than on a birth cohort basis. A complete description of themethodology for computing period-specific mortality probabilities is given elsewhere (Rutstein, 1984).Birth History Survivorship DataThe data for the estimation of mortality rates were collected in the reproduction section of theindividual woman's questionnaire. The data were obtained in the form of a truncated birth history inwhich questions were asked about the sex, date of birth, survivorship status and, if appropriate, age atdeath of the respondent's live births.The truncated birth history collected information on all births which occurred to respondentsduring the time period 1981-86. As a result of this procedure, the observed person-years of exposure tomortality are less for the older childhood ages (ages 3 and 4) than for the younger childhood ages (ages 1and 2). The decline in the number of persons exposed to mortality should not substantially increase thesampling variance of the estimated child mortality rates because older children contribute relatively littleto the overall child mortality rate. Nevertheless, in the tables of this chapter, any reported mortality ratewhich is based on fewer than 500 person-years of exposure is enclosed in parentheses.Data QualityThe truncated birth history is susceptible to the same types of data collection errors as are otherretrospective procedures; namely, underreporting of events, misreporting of age at death, andmisreporting of date of birth. Event underreporting and age at death misreporting are the more serioussources of error for mortality estimation. The O<strong>DHS</strong> data were investigated with respect to these twosources of error by testing their internal consistency. However, it should be stated that the power ofintemal consistency checks for detecting error is quite limited so that, while they can detect gross defects,they cannot detect less serious data problems and cannot defmitively establish the accuracy of the datacollected.Underreporting of deaths is most likely in the case of babies who die in early infancy. In theO<strong>DHS</strong>, age at death was recorded in one of three units: days, for deaths in the first month of life; months,for deaths under two years of age; and years, for deaths at age two and above. A test to detectunderreporting of early infant deaths was made by forming the ratio of deaths under seven days to alldeaths in the first month of life. Since mortality is known to decline steeply with age throughout earlyinfancy, the value of this ratio should exceed 0.25. For the period 1981-86, the values of this ratio from53
the O<strong>DHS</strong> are well in excess of 0.25, indicating that gross underreporting of babies who died in earlyinfancy is not a problem:BothMales Females Sexes0.73 0.64 .70Age at death misreporting can result in a net transfer of events between infancy and earlychildhood and can bias mortality estimates. The possibility of such misreporting was investigated bylooking for heaping of deaths at 12 months in the distribution of deaths by age. The dis~bution is asfollows:Deaths bv Age During 1981-86Age inBothMonths Males Females Sexes6 10 10 207 4 3 78 5 4 99 4 9 1310 1 5 611 3 4 712 6 5 1113 3 1 414 1 1 215 4 2 616 2 0 217 0 1 118 8 9 17There is some indication of heaping of deaths at 12 months of age (11 deaths at 12 months versus7 at 11 months and 4 at 13 months) but it is not significant relative to the total of 214 infant deathsreported for the 1981-86 period.Mortality Levels 1981-1986Table 6.1 displays infant and child mortality rates for Ondo State for the period 1981-1986. ForOndo State, the infant mortality rate is 56 deaths per 1,000 live births and the child mortality rate is aboutthe same, 55 per 1,000. The overall probability of dying between birth and age five is 108 per 1,000 (i.e.,about one in every ten children dies before reaching five years of age). Sex-specific rates are similar inmagnitude with male rates being higher than female rates -- a differential found in most populations. Therates by area of residence indicate somewhat lower infant and child mortality in urban areas (54 and 49per 1,000, respectively) than in rural areas (57 and 61 per 1,000, respectively). These differences are notgreat and may be due to sampling variance. The rates for riverine areas are, on the other hand, decidedlyhigher for infants (70 per 1,1300) hut lower for children age 1-4 (38 per 1,000). However, these rates arebased on fewer than 500 person-years of exposure and should be viewed with caution.54
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ONDO STATE, NIGERIADEMOGRAPHICANDHE
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This report presents the findings o
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Page4.34.44.54.64.74.8Current Use o
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PageTable 3.3Table 3.4Table 3.5Tabl
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PageTable 5.1Table 5.2Table 5.3Tabl
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PageAPPENDIX A ....................
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PREFACEThe Ondo State Demographic a
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percent of women using each) and th
- Page 20 and 21: 1. BACKGROUND1.1 Geography and Hist
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- Page 24 and 25: Table 1.2Number of Selected Primary
- Page 26 and 27: Religion and EthnicityThe majority
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- Page 33 and 34: esults must be interpreted with cau
- Page 35 and 36: Following the birth of a child, the
- Page 38 and 39: 3. FERTILITY3.1 Fertility Data in t
- Page 40 and 41: educational attainment, differences
- Page 42 and 43: distributions. The proportion with
- Page 44: Table 3.5 Percent Distribution of A
- Page 47 and 48: Table 4.1Percentage Knowing Any Met
- Page 49 and 50: Women who had heard of methods were
- Page 51 and 52: Table 4.6Percent Distribution of Al
- Page 53 and 54: Table 4.7Percent Distribution of Cu
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- Page 57 and 58: Figure 4.4Source of Family Planning
- Page 59 and 60: 4.7 Intention to Use Contraception
- Page 61 and 62: Table 4.16 presents data on wives'
- Page 63 and 64: Table 4.18Percentage of Currently M
- Page 65 and 66: Figure 5.1Fertility PreferencesCurr
- Page 67 and 68: In order to examine fertility prefe
- Page 69 and 70: Table 5.4 also indicates that less
- Page 74 and 75: Table 6.1 Infant and Child Mortalit
- Page 76 and 77: Table 6.3Mean Number of Children Ev
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- Page 84 and 85: Cough/Difficult BreathingThe ODHS c
- Page 86 and 87: Nutritional StatusNutritional statu
- Page 88 and 89: Weight-for-HeightWeight-for-height
- Page 90 and 91: Weight-for-AgeTable 6.13 shows the
- Page 92: REFERENCESCttieh-Johnson, D., Cross
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- Page 106 and 107: APPENDIX BSAMPLING ERRORSThe result
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MINISTRY OF HEALTH, C, OVERNMENT OF
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!P............IM,RSKIPattended: pri
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i SECTION 2: REPRODUCTION. ISKIP201
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TABLE 2.1rRECORD INFORMATION STARTI
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SKIP230 CHECK: COMPARE NUMBER OF BI
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I ISECTION 3:HEALTH AND BREASTFEEDI
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316317CHECK ~2:LAST BIRTH ALIVE [ ]
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SKIP334 What was done?CIRCLECODE 1
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!TABLE 3.1(ASK QUESTIONS STARTING W
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LTABLE 3.3(ASK @UESTIONS ONLY FOR S
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TABLE 3.5CF. TABLE 2.1:ENTER NAME A
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TABLE 4: IPILL "Women can take •
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SKIP413CHECK 404:NO STERILIZATION [
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SECTIOM 5: MARRIAGE. lSKIP501 /Have
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SKIP520 kow we need some detmils ab
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SKIP606 For how long should • cou
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SKIP7e9CHECK 7@8:DOES/DID NOT WORKI
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INTERVIEWER'S OBSERVATIONS.(To be t