SAMPLE DESIGN Appendix B The major objective of the 2005 Egypt Demographic and Health Survey sample design was to provide estimates with acceptable precision for key population and health indicators for the country as a whole and for six major subdivisions (Urban Governorates, urban Lower Egypt, rural Lower Egypt, urban Upper Egypt, rural Upper Egypt and the Frontier Governorates1). In addition, the sample was planned to allow for separate estimates of key indicators for seven governorates that are focal governorates for USAID-supported population, health and nutrition programs (Fayoum, Beni Suef, Menya, Qena, and Aswan in Upper Egypt and Cairo and Alexandria). In addition, with the exception of the Frontier Governorates, the sample included a sufficient number of households in most other governorates to allow for governorate-level estimates of major variables, with the exception of fertility and mortality rates and anemia levels. To achieve the above objectives, a three stage probability sample was designed. The following is a detailed description of the 2000 EDHS sample design. A description of the field activities involved in the implementation of the sample design is included in Chapter 1 of this report. B.1 SAMPLE DESIGN The main concern in developing the sample design for the 2005 EDHS was to secure a sufficient number of cases in each domain in order to reduce sampling error and provide estimates of adequate precision for the purposes of the survey. Sampling error has two components, one corresponding to the variation between primary sampling units (PSUs) and the other to the variation within PSUs, with the major component usually being the variation between PSUs. Thus, the total number of PSUs is an important factor in controlling the size of the sampling error since the variation between PSUs depends on this number, i.e., generally the smaller the number of PSUs, the greater will be the variation. Standard DHS sampling policy recommends a minimum of 1,000-1,200 women per major domain. As noted above, however, the 2005 EDHS sample had to be selected in such fashion as to also allow for estimation of contraceptive prevalence rates and other basic health indicators for 21 separate governorates. DHS sampling policy recommends that a minimum of 450 completed interviews with eligible women be obtained to provide reliable estimates for these types of variables. This principle was used in determining the size and distribution of the target sample for the 2005 EDHS presented in Table B.1. 1 The Frontier Governorates were not included in 1988 and 1992 DHS surveys nor in the 1997, 1998 and 2003 interim surveys. However, they were part of the 1995 and 2000 EDHS samples. The inclusion of the Frontier Governorates in the 2005 EDHS will not affect comparisons of the 2005 results with the results of earlier surveys in which these governorates were not part of the samples since only around one percent of the Egyptian population resides in the Frontier Governorates. Appendix B | 249 Table B.1 Sample allocation for the 2005 Egypt DHS survey Target Target Urban Rural Total number number of of house- eligible Percent Number Number of Number Number of Number Number of Governorate holds women urban of PSUs segments of PSUs segments of PSUs segments Urban Governorates Cairo 2,015 1,500 100 50 100 - - 50 100 Alexandria 1,615 1,200 100 40 80 - - 40 80 Port Said 740 550 100 18 36 - - 18 36 Suez 740 550 100 18 36 - - 18 36 Subtotal 5,110 3,800 100 126 252 - - 126 252 Lower Egypt Damietta 503 450 27 4 8 11 22 15 30 Dakahlia 894 799 28 7 14 19 38 26 52 Sharkia 866 783 23 6 12 20 40 26 52 Kalyubia 829 722 41 10 20 14 28 24 48 Kafr El-Sheikh 605 546 23 4 8 14 28 18 36 Gharbia 806 715 31 7 14 17 34 24 48 Menoufia 676 614 20 4 8 17 34 21 42 Behera 792 715 23 6 12 18 36 24 48 Ismailia 527 450 50 8 16 7 14 15 30 Subtotal 6,498 5,794 28 56 112 137 274 193 386 Upper Egypt Giza 1,060 1,000 54 18 36 17 34 35 70 Beni Suef 1,500 1,400 24 10 20 40 80 50 100 Fayoum 1,500 1,400 23 10 20 40 80 50 100 Menya 1,500 1,400 19 10 20 40 80 50 100 Assiut 640 600 27 10 20 12 24 22 44 Souhag 640 600 22 10 20 12 24 22 44 Qena1 1,500 1,400 28 11 22 39 78 50 100 Aswan 1,500 1,400 43 17 34 33 66 50 100 Subtotal 9,840 8,100 31 96 192 233 466 329 658 Frontier Governorates Red Sea 181 201 75 5 10 2 4 7 14 New Valley 168 186 48 3 6 4 8 7 14 Matrouh 214 237 56 5 10 3 6 8 16 North Sinai 234 259 59 5 10 3 6 8 16 South Sinai 105 117 50 2 4 2 4 4 8 Subtotal 902 1,000 59 20 40 14 28 34 68 Total 22,350 18,694 298 596 384 768 682 1,364 1 Luxor was grouped with Qena governorate for purposes of selecting the sample. B.2 SAMPLE FRAME The sample for the 2005 EDHS was selected in three stages. A list of shiakhas/towns constituted the primary sampling frame for urban areas, and a list of villages served as the frame for rural areas. The Central Agency of Public Mobilization and Statistics (CAPMAS) updated these lists, which had been originally prepared for the 1996 census, to reflect the situation in 2004. 250 | Appendix B B.3 SAMPLE SELECTION In order to provide for implicit geographic stratification, the lists of shiakhas/towns and villages in each governorate were arranged in serpentine order according to their location from north to south within the governorate. During the first stage selection, a total of 682 primary sampling units (289 shiakhas/towns and 393 villages) were chosen for the 2005 EDHS sample. A list of the PSUs selected during the first stage of the sampling for the 2005 EDHS is provided below. The second stage of selection in the 2005 EDHS involved several steps. First, for each of the primary sampling units (PSU), maps were obtained and divided into a number of parts of roughly equal size (assuming approximately 5000 persons per part). In large shiakhas/towns or villages (approximately 20,000 and more population), two parts were selected from each PSU. In the remaining smaller shiakhas/towns and villages, one part was selected. A quick count was carried out in the selected parts in each PSU to provide the information needed to divide the parts into a number of segments of roughly equal size. After the quick count was completed, two segments were then selected from each PSU. In large shiakhas/towns and villages where there were two parts, one segment was chosen from each part. In small shiakhas/towns and villages where only one part had been selected, two segments were chosen from that part. A household listing was obtained for each segment. Using the household lists, a systematic sample of 22,807 households was chosen for the 2005 EDHS. All ever-married women 15-49 who were present in the sampled households on the night before the interview were eligible for the survey. A subsample of one-third of all households in each segment was selected for the anemia-testing component. In this subsample, information on anemia levels was collected for all eligible women, children under age 6, and youth and young adults age 10-19. One woman in each household in the subsample in which anemia testing was carried out was selected to be asked questions about domestic violence. B.4 SAMPLE IMPLEMENTATION Results of the sample implementation are presented in Table B.2. The results indicate that households were selected for the 2000 EDHS sample. The EDHS field staff successfully interviewed 22,807 of the sample households, for a response rate of 98.9 percent. In the interviewed households, 19,565 eligible women were interviewed with a response rate 99.5 percent. This gives an overall response rate of 98.5 percent. Appendix B | 251 Table B.2 Sample implementation Percent distribution of households and eligible women by results of the household and individual interviews, and household, eligible women and overall response rates, according to urban-rural residence and place of residence, Egypt 2005 Urban Lower Egypt Upper Egypt Frontier Gover- Gover- Result Urban Rural norates Total Urban Rural Total Urban Rural norates Total Selected households Completed (C) 94.5 98.1 94.1 97.0 94.9 97.9 97.2 95.3 98.2 94.6 96.3 Household present but no competent respondent at home (HP) 1.3 0.3 1.6 0.5 0.8 0.3 0.6 1.2 0.3 0.8 0.8 Postponed (P) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 Refused (R) 0.3 0.0 0.3 0.2 0.4 0.1 0.2 0.5 0.0 0.0 0.2 Dwelling not found (DNF) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.0 Household absent (HA) 1.2 0.5 1.5 0.8 1.4 0.6 0.5 0.6 0.4 1.6 0.8 Dwelling vacant/address not a dwelling (DV) 2.1 1.0 2.1 1.3 2.2 0.9 1.4 2.1 1.0 2.6 1.6 Dwelling destroy (DD) 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Other (O) 0.3 0.1 0.3 0.2 0.4 0.1 0.1 0.2 0.1 0.2 0.2 Total 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 Number of sampled households 11,164 11,643 5,231 6,656 2,071 4,585 9,998 3,247 6,751 922 22,807 Household response rate (HRR) 98.2 99.6 98.0 99.3 98.8 99.5 99.2 98.1 99.6 99.0 98.9 Eligible women Completed (EWC) 99.4 99.7 99.2 99.7 99.6 99.8 99.5 99.4 99.6 99.9 99.5 Not at home (EWNH) 0.5 0.2 0.8 0.2 0.4 0.1 0.3 0.4 0.3 0.1 0.3 Postponed (EWP) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Refused (EWR) 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.1 0.0 0.0 Partly completed (EWPC) 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.1 0.0 0.0 Incapacitated (EWI) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 0.0 Other (EWO) 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Total 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 100.0 Number of women 8,147 11,418 3,568 5,918 1,560 4,358 9,177 2,486 6,691 902 19,565 Eligible women response rate (EWRR) 99.4 99.7 99.2 99.7 99.6 99.8 99.5 99.4 99.6 99.9