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Table 2 Comparisons of psychological symptom detection rates among Chinese adolescents by screen and exercise time (%)

From: Psychological symptoms are associated with screen and exercise time: a cross-sectional study of Chinese adolescents

Sex Category Group N Emotional symptoms Behavioral symptoms Social adaption difficulties Psychological symptoms
N (%) χ2 P N (%) χ2 P N (%) χ2 P N (%) χ2 P
Boys Screen time (h/d) <1 1792 519 (29.0) 7.69 0.02 488 (27.2) 19.37 < 0.001 325 (18.1) 9.68 0.01 397 (22.2) 6.63 0.04
1–2 1108 274 (24.7)    288 (26.0)    178 (16.1)    223 (20.1)   
>2 700 208 (29.7)    245 (35.0)    153 (21.9)    177 (25.3)   
Exercise time (min/d) <30 1311 450 (34.3) 43.66 < 0.001 414 (31.6) 10.90 < 0.001 301 (23.0) 31.21 < 0.001 354 (27.0) 28.29 < 0.001
30–60 1551 374 (24.1)    405 (26.1)    244 (15.7)    300 (19.3)   
>60 738 177 (24.0)    202 (27.4)    111 (15.0)    143 (19.4)   
Girls Screen time (h/d) <1 1906 521 (27.3) 9.78 0.01 521 (27.3) 10.26 0.01 316 (16.6) 6.76 0.03 394 (20.7) 7.11 0.03
1–2 1186 305 (25.7)    279 (23.5)    166 (14.0)    224 (18.9)   
>2 508 168 (33.1)    155 (30.5)    95 (18.7)    125 (24.6)   
Exercise time (min/d) <30 2044 640 (31.3) 41.78 < 0.001 593 (29.0) 20.23 < 0.001 392 (19.2) 38.72 < 0.001 493 (24.1) 42.58 < 0.001
30–60 1270 268 (21.1)    280 (22.0)    140 (11.0)    187 (14.7)   
>60 286 86 (30.1)    82 (28.7)    45 (15.7)    63 (22.0)   
Total Screen time (h/d) <1 3698 1040 (28.1) 14.34 < 0.001 1009 (27.3) 28.11 < 0.001 641 (17.3) 17.31 < 0.001 791 (21.4) 14.31 < 0.001
1–2 2294 579 (25.2)    567 (24.7)    344 (15.0)    447 (19.5)   
>2 1208 376 (31.1)    400 (33.1)    248 (20.5)    302 (25.0)   
Exercise time (min/d) <30 3355 1090 (32.5) 74.89 < 0.001 1007 (30.0) 25.34 < 0.001 693 (20.7) 56.58 < 0.001 847 (25.2) 59.22 < 0.001
30–60 2821 642 (22.8)    685 (24.3)    384 (13.6)    487 (17.3)   
>60 1024 263 (25.7)    284 (27.7)    156 (15.2)    206 (20.1)