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Table 2 Parental, child, and household characteristics of sample

From: Prevalence, correlates, and trajectory of screen viewing among Chinese children in Changsha: a birth cohort study

Sociodemographic Characteristic Analytic Group Excluded Group P value
Observed(n = 953) Observed(n = 23)  
Mean ± SD / % N Mean ± SD / % N  
Children gender      0.642
 Male 492 (51.6) 953 13 (56.5) 23  
 Female 461 (48.4) 10 (43.5)  
Family member number 4.31 (0.95) 953 4.0 (0.8) 23 0.166
Pregnant weight (kg) 68.38 (9.11) 953 69.6 (10.4) 23 0.525
Physical activity in pregnant period (minutes/day) 46.69 (25.94) 953 47.2 (22.2) 23 0.93
Pregnancy exercise (yes) 820 (86.9) 944 18 (81.8) 22 0.49
Pregnancy exercise intensity      0.791
 Low intensity exercise 810 (99.6) 813 19 (100) 19  
 Moderate exercise 3 (0.4) 0 (0)  
Mother physical activity behavior 275 (29.8) 923 7 (58.3) 12 0.032
Mother physical activity   278   7 0.651
 Low intensity exercise 224 (80.6)   5 (71.4)   
 Moderate exercise 46 (16.5)   2 (28.6)   
Heavy exercise 8 (2.9)   0 (0)   
Pregnancy computer use 318 (80.7) 383 0 (0) 5 0.551
Pregnancy phone use 323 (96.7) 334 4 (100) 4 0.712
Maternal race (Han) 921 (96.6) 944 23 (100) 23 0.671
Maternal age (years) 29.92 (3.92) 953 30.6 (4.7) 23 0.398
Educational level   942   22 0.721
 Less than primary school 2 (0.2)   0 (0)   
 Middle school 31 (3.3)   0 (0)   
 High school 114 (12.1)   4 (18.2)   
 University 722 (76.6)   15 (68.2)   
 Graduate school 69 (7.3)   3 (13.6)   
 Other education 4 (0.4)   0 (0)   
Maternal occupation   940   22 0.787
 1 35 (3.7)   0 (0)   
 2 178 (18.7)   6 (26.1)   
 3 365 (38.3)   8 (34.8)   
 4 2 (0.2)   0 (0)   
 5 5 (0.5)   0 (0)   
 6 355 (37.3)   8 (34.8)   
Paternal race (Han) 920 (96.5) 943 23 (100) 23 0.364
Paternal age (years) 32.06 (4.85) 953 33.0 (6.9) 23 0.384
Educational level   941   23 0.725
 Less than primary school 4 (0.4)   0 (0)   
 Middle school 25 (2.7)   1 (4.3)   
 High school 109 (11.6)   2 (8.7)   
 University 690 (73.3)   15 (65.2)   
 Graduate school 108 (11.5)   5 (21.7)   
 Other education 5 (0.5)   0 (0)   
Paternal occupation   933   23 0.658
 1 55 (5.8)   1 (4.3)   
 2 240 (25.2)   3 (13)   
 3 303 (31.8)   7 (30.4)   
 4 3 (0.3)   0 (0)   
 5 42 (4.4)   2 (8.7)   
 6 290 (30.4)   10 (43.5)   
Infant weight (kg) 3.33 (0.46) 953 3.37 (0.57) 23 0.686
Household income (yuan/month)      
 Less than 2000 yuan/month 31 (3.4) 922 0 (0) 23 0.259
 2001–5000 yuan/month 493 (53.5) 9 (39.1)  
 5001–10,000 yuan/month 360 (39.0) 14 (60.9)  
 10,001–15,000 yuan/month 28 (3.0) 0 (0)  
 More than 15,000 yuan/month 10 (1.1) 0 (0)  
Pregnancy depression 29 (3.0) 953 0 (0) 23 0.396