Table 1

Geographical distribution of NS4 cohort by strata compared with the national population

National populationNS4 participants
StrataGeographical regionChildren aged 6–15 years old in public schools, n (%)Children aged 6–15 years old in public schools, n (%)
1Yerevan99 101 (32.1)1908 (32.1)
Other urban areas97 484 (31.6)1877 (31.6)
Rural areas111 714 (36.2)2159 (36.3)
Total308 299 (100)5944 (100)
2Zone 1: Central (Yerevan)99 101 (32.1)1908 (32.1)
Zone 2: North-West (Shirak, Aragatsotn, Kotayk)70 401 (22.8)1356 (22.8)
Zone 3: North-East (Gegarkuniq, Tavush, Lori)62 645 (20.3)1208 (20.3)
Zone 4: South-West (Ararat, Armavir)57 438 (18.6)1104 (18.6)
Zone 5: South-East (Vaiots Dzor, Syuniq)18 714 (6.1)368 (6.2)
Total308 299 (100)5944 (100)
  • NS4, Nationwide School Sight Sampling Survey.