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Journal of Peking University (Health Sciences) ›› 2025, Vol. 57 ›› Issue (3): 614-619. doi: 10.19723/j.issn.1671-167X.2025.03.029

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李琳1,2,*(), 廖津津1,2   

  • Received:2022-09-05 Online:2025-06-18 Published:2025-06-13
  • Contact: 李琳
  • Supported by:
    the Ministry of Education Humanities and Social Sciences Research General Program(19YJA890014)

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CLC Number: 

  • R778.11

Table 1

Grade and gender distribution of children and adolescents"

Items Primary school Junior school High school Total
Boys 739 606 696 2 041
Girls 739 596 827 2 162
Total 1 478 1 202 1 523 4 203

Table 2

Comparison of sedentary behaviour in children and adolescents /(min/d)"

Group Total Study Screen Transportation Leisure
Normal vision 237.1±112.6 147.08±92.6 36.4±65.7 8.9±21.4 35.7±52.1
Poor vision 362.9±189.3 231.4±110.0 42.9±68.6 7.1±17.8 41.4±52.9
Boys 308.5±172.8 192.9±114.3 40.7±73.6 7.1±18.6 37.1±53.8
Girls 319.0±160.9 205.7±123.6 36.1±59.2 8.6±21.4 40.0±51.4

Figure 1

ROC Curve of sedentary behavior and vision conditions in children and adolescents"

Table 3

Results of ROC curve analysis"

Sedentary behavior AUC SE P 95%CI SE SP Maximum Youden index Sedentary time thresholds/min
Total 0.792 0.008 < 0.001 0.788-0.812 0.786 0.681 0.468 281.1
Study 0.824 0.007 < 0.001 0.812-0.835 0.814 0.613 0.428 168.3
Screen 0.524 0.001 < 0.05 0.506-0.542 0.666 0.386 0.052 21.6

Table 4

Sedentary time and visual conditions four-grid table"

Sedentary time/min Poor vision conditions, n(%) n χ2 OR(95%CI)
Yes No
Total < 281.1 559 (34.2) 1 075 (65.8) 1 634 902.485# 1.128 (1.111-1.147)
≥281.1 2 062 (80.3) 507 (19.7) 2 569
Study < 168.3 486 (33.4) 971 (66.6) 1 457 799.245# 2.331 (2.162-2.513)
≥168.3 2 135 (77.7) 611 (22.3) 2 746
Screen < 21.6 876 (58.9) 609 (53.1) 1 485 11.390# 1.250 (1.098-1.424)
≥21.6 1 745 (64.2) 973 (35.8) 2 718

Table 5

Logistic regression analysis of sedentary behavior and vision conditions in students of different grades"

Grades Sedentary time β SE Wald df P OR(95%CI)
Primary school Total 0.008 0.001 29.515 1 0.001 1.008(1.005－1.011)
Study 0.005 0.002 8.638 1 0.003 1.005(1.002－1.009)
Screen 0.004 0.001 10.377 1 0.001 1.004(1.002－1.007)
Junior school Total 0.001 0.001 0.542 1 0.462 1.000(0.999－1.002)
Study 0.019 0.002 92.845 1 0.001 1.003(1.002－1.004)
Screen 0.001 0.001 1.27 1 0.26 1.001(0.998－1.002)
High school Total 0.003 0.002 4.573 1 0.052 1.002(0.998－1.003)
Study 0.009 0.002 20.726 1 0.001 1.009(1.005－1.012)
Screen 0.002 0.001 1.899 1 0.168 1.002(0.997－1.008)

Figure 2

ROC curves for sedentary time and vision conditions at different grades A, primary school; B, junior school; C, high school."

Table 6

Sedentary time thresholds and vision conditions at different grades"

Grades Sedentary time Poor vision conditions, n(%) Total χ2 OR(95%CI)
Yes No
Primary school < 192.9 162 (21.1) 634 (78.9) 796 350.926# 2.693 (2.584-2.893)
≥192.9 575 (85.4) 107 (14.6) 682
Junior school < 251 335 (45.0) 410 (55.0) 746 294.133# 2.089 (1.923-2.269)
≥251 429 (94.1) 28 (5.9) 456
High school < 154.3 135 (31.9) 288 (68.1) 423 518.986# 2.803 (2.435-3.226)
≥154.3 984 (89.5) 116 (10.5) 1 100
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