(: . . ., 1991)
, | ||||||
, |
, (/) 15 . 7-8 1.3 /, 8-9 1.5 /, 9- 1.6 /, 10-11 1.7 /. , . (/.) , , .. (. 23).
23
(: . ., 1973)
, | , /. | , /. |
9-10 11-12 13-14 15-18 | 46.8-44.2 44.6-43.2 45.4-46.5 46.3-45.3 | 34.8-38.0 37.8-38.3 37.5-34.8 34.2-33.1 |
8-11 1.5-3 . (., ). , . . 7-9 9 /, . . , . , 20% .
- . , , . . . .
- . ( ) ( ), (.24).
24
(: . ., 1999)
, | , % | . , % | , , % |
5-6 7-8 9-10 11-12 13-14 15-16 17-18 |
, () - .
|
|
,
. , .
, , (. 25). 7- 20-22 . , . 30-50%.
25