CHAPTER EIGHT 352 TABLE 8-28. PREVALENCE, ESTIMATED NUMBER OF CASES, AND DISTRIBUTION BY TYPE OF HOUSING CONSTRUCTION,a ACTIVE XEROPHTHALMIA (AND BITOT'S SPOTS), CHILDREN UNDER AGE 6, DECEMBER-APRIL (NBS 1981) Estimated Number of Children Affected Prevalence per 100 Children Percentage of Nepal Total Wall Sample N Material --- 3,160 (2,106) 8,554 (6,601) 4,095 (3,117) 1,270 (718) 1,433 (990) 2.1 (1.3) 1.2 (0.9) 0.5 (0.4) 0.5 (0.3) 0.7 (0.5) 15.1 (13.6) 41.0 (42.5) 19.6 (20.1) 6.1 (4.6) 6.9 (6.4) Thatch Mud Stone Wood Bamboo Brick Cement Other Subtotal Missing data 461 2,180 2,510 711 562 483 120 158 7,185 395 1,015 (1,015) 0.6 (0.6) 4.9 (6.5) - (-) 2.5 (1.9) 0.9 (0.6) NA (NA) - (-) 1,331 (987) 20,858 (15,534) 0 (0) - (-) 6.4 (6.3) 100.0 (100.0) NA (NA) Total 7,580 20,858 (15,534) 0.9 (0.6) 100.0 (100.0) Source: FR8.002 AN.86, 102 M .Note: Figures in parentheses refer to the estimated number of cases, prevalence, and distribution of active xerophthalmia that are Bitot's spots. aDefined as materials used to make walls of house. TABLE 8-29. PREVALENCE, ESTIMATED NUMBER OF CASES, AND DISTRIBUTION BY FAMILY OWNERSHIP OF A WATCH, ACTIVE XEROPHTHALMIA (AND BITOT'S SPOTS), CHILDREN UNDER AGE 6, DECEMBER-APRIL (NBS 1981) Estimated Number of Children Affected Prevalence per 100 Children Percentage of Nepal's Total Sample N Own Watch Yes No Subtotal Missing data 1,231 5,967 7,198 382 2,048 (1,719) 18,810 (13,815) 20,858 (15,534) 0 (0) 0.5 (0.4) 0.9 (0.6) 0.9 (0.6) NA (NA) 0.9 (0.6) 9.8 (11.1) 90.2 (88.9) 100.0 (100.0) NA (NA) 100.0 (100.0) Total 7,580 20,858 (15,534) Source: FR8.002 AN.143, 159 M aNote: Figures in parentheses refer to the estimated number of cases, prevalence, and distribution of cases with active xerophthal- mia that are Bitot's spots.