Table 2.
Distribution characteristics of ADHD symptoms among preschool children Note:The chi-square test (categorical variables) and t test (continuous variables) were used to test the distribution difference
| Group | Non-ADHD symptoms | ADHD symptoms | P | |
|---|---|---|---|---|
| Total, n (%) | 2260 (96.5) | 82 (3.5) | ||
| Screen time > 1 h in weekdays, n (%) | 0.001 | |||
| No | 1800 (81.6) | 54 (66.7) | ||
| Yes | 407 (18.4) | 27 (33.3) | ||
| Screen time > 1 h in weekend, n (%) | 0.045 | |||
| No | 1157 (52.7) | 34 (41.5) | ||
| Yes | 1038 (47.3) | 48 (58.5) | ||
| Average screen time > 1 h, n (%) | 0.003 | |||
| No | 1297 (59.5) | 35 (43.2) | ||
| Yes | 884 (40.5) | 46 (56.8) | ||
| Children age (years) (Mean ± SD) | 0.060 | |||
| 5.24 ± 0.63 | 5.11 ± 0.67 | |||
| Gender, n (%) | 0.001 | |||
| Boys | 1220 (54.0) | 59 ( 72.0) | ||
| Girls | 1040 (46.0) | 23 (28.0) | ||
| Age at pregnancy (years) (Mean ± SD) | 0.104 | |||
| 27.71 ± 3.95 | 26.99 ± 4.00 | |||
| Premature, n (%) | 0.922 | |||
| Non-premature | 2155 (95.4) | 78 (95.1) | ||
| Premature delivery | 105 (4.6) | 4 (4.9) | ||
| Paternal education levels, n (%) | 0.030 | |||
| Junior high school and below | 163 (7.3) | 13 (15.9) | ||
| Senior high school | 323 (14.3) | 13 (15.9) | ||
| College degree and above | 1657 (73.3) | 52 (63.4) | ||
| Unknown | 116 (5.1) | 4 (4.9) | ||
| Maternal education levels, n (%) | 0.043 | |||
| Junior high school and below | 213 (9.4) | 15 (18.3) | ||
| Senior high school | 292 (12.9) | 12 (14.6) | ||
| College degree and above | 1664 (73.6) | 51 (62.2) | ||
| Unknown | 91 (4.0) | 4 (4.9) | ||
| Number of children in family, n (%) | 0.628 | |||
| One | 1145 (50.9) | 44 (53.7) | ||
| Two and more | 1103 (49.1) | 38 (46.3) | ||
| Overweight or obesity, n (%) | 0.095 | |||
| No | 1749 (77.4) | 57 (69.5) | ||
| Yes | 511 (22.6) | 25 (30.5) | ||
Note:The chi-square test (categorical variables) and t test (continuous variables) were used to test the distribution difference.