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Table 1 Associations of physical activity time categories with potential confounders among urban high-school students in Nanjing, China

From: Physical activity inversely associated with the presence of depression among urban adolescents in regional China

  Physical Activity Time (hr/wk) (n, %)   
Characteristics 0–0.9 1–7 8–14 15 + χ 2 p*
Gender       
   Girls 286 (54.8) 590 (56.0) 243 (49.2) 145 (38.7) 36.659 < 0.001
   Boys 236 (45.2) 463 (44.0) 251 (50.8) 230 (61.3)   
School Grade       
   7 132 (25.3) 337 (32.0) 159 (32.2) 140 (37.3) 24.219 < 0.001
   8 173 (33.1) 350 (33.2) 176 (35.6) 130 (34.7)   
   9 217(41.6) 366 (34.8) 159 (32.2) 105 (28.0)   
Body Mass Index       
   Non-overweight 450 (86.2) 933 (88.6) 444 (89.9) 341 (90.9) 6.588 0.361
   Overweight 47 (9.0) 77 (7.3) 35 (7.1) 24 (6.4)   
   Obesity 25 (4.8) 43 (4.1) 15 (3.0) 10 (2.7)   
Father education       
   Junior high school or less 180 (34.5) 366 (34.8) 142 (28.7) 140 (37.3) 31.108 < 0.001
   Senior high school 222 (42.5) 454 (43.1) 205 (41.5) 175 (46.7)   
   Undergraduate 102 (19.5) 195 (18.5) 125 (25.3) 42 (11.2)   
   Graduate 18 (3.4) 38 (3.6) 22 (4.5) 18 (4.8)   
Mother education       
   Junior high school or less 242 (46.4) 475 (45.1) 188 (38.1) 135 (36.0) 50.965 < 0.001
   Senior high school 222 (42.5) 434 (41.2 189 (38.3) 155 (41.3)   
   Undergraduate 52 (10.0) 130 (12.3) 110 (22.3) 77 (20.5)   
   Graduate 6 (1.1) 14 (1.3) 7 (1.4) 8 (2.1)   
Family structure       
   Both parents 480 (92.0) 925 (87.8) 413 (83.6) 320 (85.3) 24.745 < 0.001
   Single parent 24 (4.6) 88 (8.4) 63 (12.8) 43 (11.5)   
   Others 18 (3.4) 40 (3.8) 18 (3.6) 12 (3.2)   
Study time      
   Low 205 (39.3) 314 (29.8) 171 (34.6) 141 (37.6) 28.148 < 0.001
   Middle 141 (27.0) 351 (33.3) 175 (35.4) 132 (35.2)   
   High 176 (33.7) 388 (36.8) 148 (30.0) 102 (27.2)   
Sleep time      
   Low 200 (38.3) 348 (33.0) 138 (27.9) 112 (29.9) 22.317 0.001
   Middle 144 (27.6) 366 (34.8) 173 (35.0) 113 (30.1)   
   High 178 (34.1) 339 (32.2) 183 (37.0) 150 (40.0)   
TV time      
   Low 148 (28.4) 338 (32.1) 170 (34.4) 150 (40.0) 41.527 < 0.001
   Middle 150 (28.7) 313 (29.7) 182 (36.8) 125 (33.3)   
   High 224 (42.9) 402 (38.2) 142 (28.7) 100 (26.7)   
Alcohol consumption       
   Non 380 (72.8) 715 (67.9) 394 (79.8) 285 (76.0) 26.589 < 0.001
   Yes 142 (27.2) 338 (32.1) 100 (20.2) 90 (24.0)   
Smoking behavior       
   Non 491 (94.1) 989 (93.9) 476 (96.4) 360 (96.0) 5.701 0.127
   Yes 31 (5.9) 64 (6.1) 18 (3.6) 15 (4.0)   
Unintentional injuries       
   Non 348 (66.7) 666 (63.2) 311 (63.0) 224 (59.7) 4.624 0.201
   Yes 174 (33.3) 387 (36.8) 183 (37.0) 151 (40.3)   
Overall 522 (21.4) 1053 (43.1) 494 (20.2) 375 (15.3) - -
  1. n = number of participants within subgroup; % = Percentages across column.
  2. * p-value between sub-groups of each variable.
  3. † Study time, sleep time, and TV time were classified into tertiles, separately.