Male

Female

School year (Age, y)

Rural

Metropolitan

All

Rural

Metropolitan

All

1 (6)

74.13 ± 28.13

(17, 151)

80.84 ± 22.92

(63, 1337)

79.62 ± 24.00

(80, 1488)

64.59 ± 37.65

(16, 139)

72.10 ± 21.43

(69, 1440)

70.91 ± 25.11

(85, 1579)

2 (7)

84.92 ± 27.08

(18, 187)

84.87 ± 22.96

(69, 1406)

84.88 ± 23.70

(87, 1593)

71.67 ± 27.51

(18, 174)

80.56 ± 22.95

(75, 1552)

78.84 ± 24.00

(93, 1726)

3 (8)

87.14 ± 26.94

(19, 178)

87.70 ± 20.99

(83, 1806)

87.49 ± 22.42

(102, 1984)

82.20 ± 32.55

(19, 165)

83.45 ± 21.20

(88, 1862)

83.11 ± 23.84

(107, 2027)

4 (9)

90.67 ± 29.94

(20, 207)

86.63 ± 20.21

(78, 1622)

86.85 ± 22.84

(98, 1829)

75.93 ± 27.74

(19, 147)

86.75 ± 20.26

(85, 1761)

84.12 ± 22.75

(104, 1908)

5 (10)

96.22 ± 32.69

(17, 154)

91.91 ± 21.46

(79, 1634)

93.14 ± 23.73

(96, 1788)

90.47 ± 27.08

(17, 138)

86.70 ± 20.03

(87, 1862)

87.70 ± 21.50

(104, 2000)

6 (11)

99.41 ± 30.67

(16, 131)

92.71 ± 20.00

(74, 1552)

93.90 ± 22.21

(90, 1683)

93.59 ± 27.59

(16, 130)

92.01 ± 17.66

(81, 1849)

92.27 ± 19.47

(97, 1979)

7 (12)

104.82 ± 28.79

(17, 137)

93.42 ± 17.91

(69, 1394)

95.04 ± 21.00

(86, 1531)

100.22 ± 28.88

(16, 128)

93.56 ± 18.15

(76, 1793)

93.47 ± 21.90

(92, 1921)

1 - 7 (6 - 12)

90.85 ± 29.95

(124, 1145)

88.45 ± 21.23

(515, 10751)

88.82 ± 23.29

(639, 11,896)

82.37 ± 31.47

(121, 1021)

85.28 ± 21.18

(561, 12,119)

84.57 ± 23.64

(682, 13,140)