Decision-makingwas prior <strong>to</strong> 2001, a time series of annual life tables(adjusted if <strong>the</strong> registration level was incomplete) between1985 <strong>and</strong> <strong>the</strong> latest available year was used <strong>to</strong> projectlevels of child <strong>and</strong> adult mortality for 2001. For smallcountries with populations of less than 500 000, movingaverages were used <strong>to</strong> smooth <strong>the</strong> time series. Projectedvalues of child <strong>and</strong> adult mortality were <strong>the</strong>n applied <strong>to</strong> amodified logit life table model 6 , using <strong>the</strong> most recentnational data as <strong>the</strong> st<strong>and</strong>ard, <strong>to</strong> predict <strong>the</strong> full life tablefor 2001, <strong>and</strong> HIV/AIDS <strong>and</strong> war deaths were added <strong>to</strong><strong>to</strong>tal mortality rates for 2001 where necessary. Thismethod was applied for 40 countries using a <strong>to</strong>tal of 711country-years of death registration data.✜ Countries with o<strong>the</strong>r information on levels of child <strong>and</strong>adult mortality. For 37 countries, estimated levels ofchild <strong>and</strong> adult mortality were applied <strong>to</strong> a modified logitlife table model 6 , using a global st<strong>and</strong>ard, <strong>to</strong> estimate <strong>the</strong>full life table for 2001, <strong>and</strong> HIV/AIDS deaths <strong>and</strong> wardeaths were added <strong>to</strong> <strong>to</strong>tal mortality rates as necessary.For most of <strong>the</strong>se countries, data on levels of adultmortality were obtained from death registration data,official life tables, or mortality information derived fromo<strong>the</strong>r sources such as censuses <strong>and</strong> surveys. The allcausemortality envelope for China was derived from atime series analysis of deaths for every household inChina reported in <strong>the</strong> 1982, 1990, <strong>and</strong> 2000 censuses.The extent of underreporting of deaths in <strong>the</strong> 2000census was estimated at about 11.3% for males <strong>and</strong>18.1% for females 1 . The all-cause mortality envelope forIndia was derived from a time series analysis of agespecificdeath rates from <strong>the</strong> sample registration systemafter correction for underregistration (88%completeness) 8 .✜ Countries with information on levels of child mortalityonly. For 55 countries, 42 of <strong>the</strong>m in sub-SaharanAfrica, no information was available on levels of adultmortality. Based on <strong>the</strong> predicted level of child mortalityin 2001, <strong>the</strong> most likely corresponding level of adultmortality (excluding HIV/AIDS deaths where necessary)was selected, along with uncertainty ranges, based onregression models of child versus adult mortality asobserved in a set of almost 2000 life tables judged <strong>to</strong> beof good quality 2,6 . These estimated levels of child <strong>and</strong>adult mortality were <strong>the</strong>n applied <strong>to</strong> a modified logit lifetable model, using a global st<strong>and</strong>ard, <strong>to</strong> estimate <strong>the</strong> fulllife table in 2001, <strong>and</strong> HIV/AIDS deaths <strong>and</strong> war deathswere added <strong>to</strong> <strong>to</strong>tal mortality rates as necessary.Evidence on adult mortality in sub-Saharan Africancountries remains limited, even in areas with successfulchild <strong>and</strong> maternal mortality surveys.Classification of causes of disease <strong>and</strong> injuryDisease <strong>and</strong> injury causes of death <strong>and</strong> of burden of diseasewere classified using <strong>the</strong> same tree structure as in <strong>the</strong> originalGBD study 7 . The first level of disaggregation comprises <strong>the</strong>following three broad cause groups:✜ Group I: communicable, maternal, perinatal, <strong>and</strong>nutritional conditions;✜ Group II: noncommunicable diseases;✜ Group III: injuries.Each group was <strong>the</strong>n divided in<strong>to</strong> major causesubcategories, for example, cardiovascular disease (CVD) <strong>and</strong>malignant neoplasms (cancers) are two major causesubcategories of Group II. Beyond this level, two fur<strong>the</strong>rdisaggregation levels were used, resulting in a completecause list of 135 categories of specific diseases <strong>and</strong> injuries.Group I causes of death consist of <strong>the</strong> cluster of conditionsthat typically decline at a faster pace than all-cause mortalityduring <strong>the</strong> epidemiological transition. In high-mortalitypopulations, Group I dominates <strong>the</strong> cause of death pattern,whereas in low-mortality populations, Group I accounts foronly a small proportion of deaths. The major causesubcategories are closely based on <strong>the</strong> ICD chapters with afew significant differences. Whereas <strong>the</strong> ICD classifies chronicrespira<strong>to</strong>ry diseases <strong>and</strong> acute respira<strong>to</strong>ry infections in<strong>to</strong> <strong>the</strong>same chapter, <strong>the</strong> GBD cause classification includes acuterespira<strong>to</strong>ry infections in Group I <strong>and</strong> chronic respira<strong>to</strong>rydiseases in Group II. Note also that <strong>the</strong> Group I subcategoryof “causes arising in <strong>the</strong> perinatal period” relates <strong>to</strong> <strong>the</strong>causes included in <strong>the</strong> corresponding ICD chapter, principallylow birth weight, prematurity, birth asphyxia, <strong>and</strong> birthtrauma, but does not include all causes of deaths occurringduring <strong>the</strong> perinatal period, such as infections, congenitalmalformations, <strong>and</strong> injuries. In addition, <strong>the</strong> GBD includesonly deaths among children born alive <strong>and</strong> does notestimate stillbirths.The GBD classification system does not include <strong>the</strong> ICDcategory “Symp<strong>to</strong>ms, signs, <strong>and</strong> ill-defined conditions” as oneof <strong>the</strong> major causes of deaths. The GBD classification schemehas reassigned deaths assigned <strong>to</strong> this ICD category, as wellas some o<strong>the</strong>r codes used for ill-defined conditions, <strong>to</strong>specific causes of death. This is important from <strong>the</strong>perspective of generating useful information <strong>to</strong> comparecause of death patterns or <strong>to</strong> inform <strong>health</strong> policy-making,because it allows unbiased comparisons of cause of deathpatterns across countries or regions.Deaths are categorically attributed <strong>to</strong> one underlying causeusing ICD rules <strong>and</strong> conventions. In some cases where <strong>the</strong>ICD rules are ambiguous, <strong>the</strong> GBD 2001 follows <strong>the</strong>conventions used by <strong>the</strong> GBD 1990 study 7 . It should also benoted that a number of causes of death act as risk fac<strong>to</strong>rs foro<strong>the</strong>r diseases. Total mortality attributable <strong>to</strong> such causesmay be substantially larger than <strong>the</strong> mortality estimates for<strong>the</strong> cause in terms of ICD rules for underlying causes. Forexample, <strong>the</strong> GBD 2001 estimates that 960 000 deaths weredue <strong>to</strong> diabetes mellitus as an underlying cause, but whendeaths from CVD <strong>and</strong> renal failure attributable <strong>to</strong> diabetes areincluded, <strong>the</strong> global <strong>to</strong>tal of attributable deaths rises <strong>to</strong> almost3 million 9 . O<strong>the</strong>r causes for which important components ofattributable mortality are included elsewhere in <strong>the</strong> GBDcause list include hepatitis B or C (attributable liver cancer<strong>and</strong> renal failure), unipolar or bipolar depressive disorders<strong>and</strong> schizophrenia (attributable suicide), <strong>and</strong> blindness(mortality attributable <strong>to</strong> blindness whe<strong>the</strong>r from infectious ornon-infectious causes).164 ✜ Global Forum Update on Research for Health Volume 4
Decision-makingDeaths Crude death % of deaths Probability of dying per 1000 Expectation(millions) rate per 1000 under 5 over 60 5q0 45q15 60q0 20q60 of life at birth(years)Low- <strong>and</strong> middle-income 1990 22.5 10.1 27.9 39.5 98 269 351 712 59.92001 22.5 9.7 21.2 42.2 86 269 341 667 61.2East Asia <strong>and</strong> Pacific 1990 6.6 8.0 16.3 50.6 54 215 265 699 64.92001 6.9 7.4 10.2 56.2 41 189 228 623 67.8Europe <strong>and</strong> Central Asia 1990 2.5 11.1 7.9 55.9 45 286 323 696 63.62001 3.0 13.0 3.2 59.6 32 328 353 711 63.0Latin America <strong>and</strong> 1990 1.7 7.8 19.5 44.7 56 245 294 640 64.5<strong>the</strong> Caribbean 2001 1.8 7.0 12.4 49.1 38 218 252 572 67.6Middle East <strong>and</strong> North Africa 1990 1.0 8.2 34.9 34.2 83 247 318 688 62.02001 1.1 6.8 21.6 45.2 56 216 267 674 65.2South Asia 1990 6.8 11.7 32.4 35.0 122 310 407 754 56.42001 7.1 9.9 25.1 39.2 94 285 362 710 59.9Sub-Saharan Africa 1990 3.9 15.6 54.1 17.0 191 386 517 758 49.62001 5.6 16.9 42.2 16.9 178 518 616 760 46.0High-income 1990 3.9 9.1 1.7 76.2 12 148 160 542 72.92001 4.0 8.8 1.0 78.7 7 124 132 469 75.5World 1990 26.4 10.0 24.0 44.8 91 245 323 667 61.72001 29.5 9.6 18.5 47.2 80 243 312 618 63.1Note: a) Estimates for 1990 based on country-level life tables from vital registration data or Modmatch (see methods section)b) Estimates for 2001 derived from Lopez et al. 2002 c) Estimates for child mortality <strong>to</strong> nearest whole number. Source: Lopez et al. 2006Table 1a: Selected mortality characteristics in males by World Bank region, 1990 <strong>and</strong> 2001Deaths Crude death % of deaths Probability of dying per 1000 Expectation(millions) rate per 1000 under 5 over 60 5q0 45q15 60q0 20q60 of life at birth(years)Low <strong>and</strong> middle-income 1990 19.4 8.9 29.7 44.6 95 182 270 585 64.22001 22.8 8.8 22.5 48.3 86 191 271 554 64.9East Asia <strong>and</strong> Pacific 1990 5.5 7.0 17.8 56.2 53 152 204 577 68.82001 6.1 6.8 11.4 64.6 44 127 171 519 71.3Europe <strong>and</strong> Central Asia 1990 2.4 9.9 6.4 77.5 37 125 162 503 72.32001 2.7 10.8 2.9 81.5 26 133 159 511 72.8Latin America 1990 1.3 5.7 20.1 53.9 45 138 182 493 71.3<strong>the</strong> Caribbean 2001 1.4 5.4 12.5 61.3 32 124 155 434 73.9Middle East <strong>and</strong> North Africa 1990 0.8 6.9 37.7 36.1 76 174 245 593 66.12001 0.8 5.5 23.5 49.7 51 144 193 562 69.5South Asia 1990 6.1 11.2 37.0 33.7 131 243 357 680 57.92001 6.5 9.6 28.3 40.2 101 226 317 645 61.5Sub-Saharan Africa 1990 3.3 12.9 54.8 19.6 168 265 403 664 55.12001 5.2 15.5 40.9 18.3 166 437 545 680 48.9High-income 1990 3.6 8.2 1.3 87.3 9 74 83 346 79.72001 3.9 8.2 0.8 88.3 6 65 73 297 81.6World 1990 23.0 8.8 25.2 51.3 88 161 244 516 66.62001 26.7 8.7 19.3 54.1 80 168 244 487 67.3Note: a) Estimates for 1990 based on country-level life tables from vital registration data or Modmatch (see methods section)b) Estimates for 2001 derived from Lopez et al. 2002 c) Estimates for child mortality <strong>to</strong> nearest whole number. Source: Lopez et al. 2006Table 1b: Selected mortality characteristics in females by World Bank region, 1990 <strong>and</strong> 2001Global Forum Update on Research for Health Volume 4 ✜ 165