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| 2004 | 2006 | 2009 | 2011 | 2015 | Time trend p value |
| Low Urbanization -boys (n = 1805) |
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| 6 - 10 yrs |
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| In continuous (hrs/d) | 1.50 (0.96) | 1.87 (0.90) | 1.94 (0.98) | 1.82 (1.06) | 1.77 (1.48) | 0.041 |
| >2 hrs/d, n (%) | 25 (22.3) | 46 (40.4) | 23 (41.1) | 26 (32.1) | 21 (35.0) | 0.036 |
| 11 - 18 yrs |
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| In continuous (hrs/d) | 1.35 (1.73) | 1.73 (1.41) | 2.20 (1.54) | 2.10 (2.26) | 1.37 (2.41) | <0.001 |
| >2 hrs/d (n, %) | 47 (18.4) | 52 (32.7) | 57 (47.9) | 33 (36.3) | 15 (24.2) | <0.001 |
| 19 - 24 yrs |
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| In continuous (hrs/d) | 1.87 (1.39) | 2.47 (1.54) | 2.86 (2.14) | 3.23 (2.34) | 2.84 (3.49) | <0.001 |
| >2 hrs/d (n, %) | 42 (34.4) | 36 (49.3) | 36 (55.4) | 31 (59.6) | 14 (35.9) | 0.005 |
| Low Urbanization - girls (n = 1845) |
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| 6 - 10 yrs |
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| In continuous (hrs/d) | 1.30 (0.94) | 1.70 (1.03) | 1.79 (0.96) | 1.83 (0.98) | 1.51 (1.15) | 0.061 |
| >2 hrs/d (n, %) | 16 (17.8) | 25 (34.2) | 15 (36.6) | 26 (35.6) | 14 (30.4) | 0.077 |
| 11 - 18 yrs |
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| In continuous (hrs/d) | 1.21 (1.08) | 1.48 (0.98) | 1.56 (1.29) | 1.39 (0.86) | 1.11 (1.26) | 0.021 |
| >2 hrs/d (n, %) | 32 (15.2) | 32 (25.0) | 30 (34.9) | 16 (20.3) | 13 (22.8) | 0.005 |
| 19 - 24 yrs |
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| In continuous (hrs/d) | 1.75 (1.37) | 2.23 (1.43) | 2.77 (2.18) | 2.60 (1.66) | 1.91 (2.30) | 0.001 |
| >2 hrs/d (n, %) | 31 (30.4) | 28 (41.2) | 45 (54.2) | 35 (56.5) | 11 (33.3) | 0.002 |
| Medium Urbanization-boys (n = 4050) |
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| 6 - 10 yrs (n) |
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| In continuous (hrs/d) | 1.41 (1.02) | 1.57 (1.08) | 1.83 (1.45) | 1.84 (1.20) | 1.73 (1.37) | 0.035 |
| >2 hrs/d (n, %) | 27 (23.9) | 32 (28.3) | 40 (31.5) | 52 (34.4) | 65 (31.6) | 0.426 |
| 11 - 18 yrs |
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| In continuous (hrs/d) | 1.45 (1.23) | 1.93 (1.81) | 1.92 (1.79) | 2.13 (1.68) | 1.90 (2.34) | <0.001 |
| >2 hrs/d (n, %) | 79 (26.2) | 66 (32.5) | 86 (37.1) | 94 (43.5) | 100 (32.1) | 0.001 |
| 19 - 24 yrs |
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| In continuous (hrs/d) | 1.87 (1.43) | 3.23 (2.50) | 3.56 (2.78) | 4.28 (2.79) | 2.54 (3.35) | <0.001 |
| >2 hrs/d (n, %) | 60 (33.5) | 84 (60.4) | 122 (65.2) | 115 (75.7) | 82 (41.6) | 0.190 |
| Medium Urbanization - girls (n = 3419) |
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| 6 - 10 yrs (n) |
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| In continuous (hrs/d) | 1.37 (0.93) | 1.54 (1.11) | 1.82 (1.10) | 1.78 (1.13) | 1.81 (1.43) | 0.012 |
| >2 hrs/d (n, %) | 22 (21.2) | 27 (25.5) | 41 (38.3) | 40 (33.1) | 67 (38.7) | 0.010 |
| 11 - 18 yrs |
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