CHILDHOOD BLINDNESS 333 TABLE 8-12. PREVALENCE, ESTIMATED NUMBER OF CASES, AND DISTRIBUTION BY TERRAIN, 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 Terrain Terai Hills Mountains Valleys Subtotal Missing data 3,315 3,326 258 305 7,204 376 7,580 15,785 (12,103) 1.4 (1.0) 0.4 (0.3) -(-)' - (-) 0.8 (0.6) NA (NA) 0.8 (0.6) 75.7 (77.9) 5,073 (3,431) 24.3 (22.1) -(-) - (-) - (-) 20,858 (15,534) 6 (0) 20,858 (15,534) - (-) 100.0 (100.0) NA (NA) 100.0 (100.0) Total Source: FR8.002 AN.79, 89M Note: Figures in parentheses refer to the estimated number of cases, prevalence, and distribution of cases of active xerophthalmia that are Bitot's spots (stage XlB). TABLE 8-IS. PREVALENCE, ESTIMATED NUMBER OF CASES, AND DISTRIBUTION BY ALTITUDE, 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 Elevation (in meters) Sample N < 185 meters 186-350 351-1000 1001-1500 1501-2272 Subtotal Missing data 1,163 1,781 1,154 1,484 1,172 7,204 376 11,437 (9,008) 4,348 (3,095) 1,282 (658) 1,356 (1,005) 2,435 (1,768) 20,858 (15.534) 6 (0) 2.0 (1.5) 0.7 (0.5) 0.3 (0.2) 0.3 (0.2) 0.6 (0.4) 0.8 (0.6) NA (NA) 54.8 (58.0) 20.9 Cl9.9) 6.1 (4.2) 6.5 (6.5) 11.7 (11.4) 100.0 (100.0) NA (NA) Total 7,580 20,858 (15,534) 0.8 (0.6) 100.0 (100.0) Source: FRS.002 AN.98, 114 M Note: Figures in parentheses refer to the estimated number of cases, prevalence, and distribution of cases of active xerophthalmia that are Bitot's spots (stage XlB). has concentrations of population along the Indian border that in- clude migrants who have entered Nepal recently. The terrain of
