populations

number of subjects

mean RD

male

female

Northeastern Thais * (10-12 years old)

260

15.89(1.80)

16.19(1.48)

Northeastern Thais adults15

461

14.72(1.21)

16.53(1.18)

Spanish7

200

16.23(1.39)

17.91(1.47)

South Indian5

500

12.80(0.90)

14.60(0.08)

South Indian13

550

12.47(1.49)

14.15(1.68)

Indian14

200

11.05(1.11)

14.20(0.63)

Chinese6

200

11.73(1.07)

14.15(1.04)

Malaysian6

100

11.44(0.99)

13.63(0.90)

African-American4

400

10.50(1.15)

12.61(1.43)

Amerindian (Mataco-Mataguayo)15

121

16.62(2.71)

17.82(2.87)

Amerindian (10-12 years old; Mataco-Mataguayo)16

66

20.90(NA)

20.27(NA)

*present study standard deviation is in parenthesis.                         NA not available
Table 4: Comparison of mean RD among various populations.