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Table 2 Time trends of health risk behaviors in subjects by grade (n = 1,820)

From: Changes in health risk behaviors of elementary school students in northern Taiwan from 2001 to 2003: results from the child and adolescent behaviors in long-term evolution study

Behaviors Total Boys Girls
  Grade 4 (2001) Grade 5 (2002) Grade 6 (2003) Linear trend analysis Grade 4 (2001) Grade 5 (2002) Grade 6 (2003) Linear trend analysis Grade 4 (2001) Grade 5 (2002) Grade 6 (2003) Linear trend analysis
  Mean SD Mean SD Mean SD T value Sig. Mean SD Mean SD Mean SD T value Sig. Mean SD Mean SD Mean SD T value Sig.
1. Swearing 1.75 0.77 1.79 0.78 2.00 0.84 11.87 *** 1.86 0.81 1.91 0.83 2.11 0.83 8.56 *** 1.65 0.71 1.66 0.71 1.89 0.83 8.24 ***
2. Staying up late 2.34 0.93 2.34 0.95 2.56 0.93 8.56 *** 2.38 0.95 2.38 0.99 2.57 0.93 5.18 *** 2.30 0.92 2.29 0.90 2.55 0.92 7.03 ***
3. Playing video games for prolonged periods 1.63 0.87 1.53 0.87 1.75 0.99 4.61 *** 1.86 0.97 1.80 1.00 1.99 1.08 3.30 ** 1.39 0.66 1.25 0.57 1.48 0.80 3.29 **
4. Vandalism 1.08 0.31 1.09 0.33 1.10 0.34 1.67 - 1.12 0.38 1.12 0.40 1.13 0.39 0.34 - 1.04 0.19 1.05 0.24 1.06 0.28 2.68 **
5. Watching TV for prolonged periods 2.11 0.98 1.99 0.99 2.15 1.00 1.35 - 2.18 1.02 2.05 1.04 2.17 1.02 -0.28 - 2.04 0.94 1.92 0.93 2.12 0.97 2.36 *
6. Eating snacks at night 2.02 0.92 1.97 0.90 2.05 0.89 1.10 - 2.01 0.94 2.03 0.94 2.09 0.92 2.14 * 2.03 0.89 1.92 0.85 2.00 0.85 -0.71 -
7. Throwing things when angry 1.34 0.62 1.27 0.58 1.34 0.62 -0.01 - 1.40 0.68 1.33 0.64 1.39 0.67 -0.57 - 1.28 0.55 1.22 0.50 1.29 0.57 0.73 -
8. Smoking 1.02 0.15 1.01 0.13 1.01 0.11 -1.77 - 1.03 0.20 1.02 0.17 1.01 0.12 -2.28 * 1.00 0.08 1.00 0.07 1.01 0.09 0.61 -
9. Eating fast food 1.74 0.65 1.72 0.62 1.70 0.63 -2.42 * 1.77 0.67 1.74 0.64 1.73 0.65 -1.61 - 1.71 0.63 1.69 0.59 1.66 0.59 -1.85 -
10. Hitting others 1.67 0.71 1.46 0.67 1.62 0.73 -2.47 * 1.72 0.74 1.46 0.67 1.58 0.72 -4.76 *** 1.61 0.68 1.47 0.68 1.66 0.75 1.45 -
11. Chewing betel nut 1.02 0.17 1.00 0.09 1.00 0.06 -3.57 *** 1.03 0.22 1.01 0.12 1.00 0.08 -3.14 ** 1.00 0.08 1.00 0.03 1.00 0.00 -1.85 -
12. Drinking alcohol 1.10 0.36 1.07 0.28 1.07 0.31 -3.62 *** 1.13 0.41 1.09 0.33 1.07 0.34 -3.95 *** 1.07 0.28 1.04 0.20 1.06 0.28 -0.78 -
13. Suppressing urination 1.66 0.71 1.53 0.64 1.55 0.64 -5.94 *** 1.65 0.74 1.50 0.62 1.52 0.63 -4.77 *** 1.67 0.69 1.55 0.65 1.58 0.65 -3.57 ***
  1. *: p < 0.05, **: p < 0.01, ***: P < 0.001.