Table 2.
Characteristics and potential confounders of participants in each group
| Characteristics | Entire cohort | Control group | Duration of general anesthesia | ||
|---|---|---|---|---|---|
| < 1 h | 2–3 h | > 3 h | |||
| Number of subjects | 209 | 30 | 49 | 51 | 79 |
| Patient characteristics | |||||
| Boys, n (%) | 107 (51.2) | 15 (50.0) | 26 (53.1) | 26 (50.1) | 40 (50.6) |
| Age, n (%) | |||||
| Younger (6-7 years old) | 67 (32.1) | 7 (23.3) | 12 (24.5) | 16 (31.4) | 32 (40.5) |
| Middle (8–9 years old) | 88 (42.1) | 16 (53.3) | 20 (40.8) | 23 (45.1) | 29 (36.7) |
| Older (10–12 years old) | 54 (25.8) | 7 (23.3) | 17 (34.7) | 12 (23.5) | 18 (22.8) |
| Full-term pregnancy, n (%) | 110 (52.6) | 18 (60.0) | 28 (57.1) | 27 (52.9) | 37 (46.8) |
| The education of mother | |||||
| Low (elementary school) | 47 (22.5) | 5 (16.7) | 8 (16.3) | 12 (23.5) | 22 (27.8) |
| Middle (secondary school) | 131 (62.7) | 22 (73.3) | 30 (61.2) | 34 (66.7) | 45 (57.0) |
| High (tertiary education) | 31 (14.8) | 3 (10.0) | 11 (22.4) | 5 (10.0) | 12 (15.2) |
Distribution of the participants’ characteristics and potential confounders are shown for the entire cohort and across the 4 groups of anesthetic exposure durations. Values represent n (%) for categorical variables