Table 4.
Basic characteristics of the participants.
| N | Infant’s sex | Mother’s age | ||||||
|---|---|---|---|---|---|---|---|---|
| Male | Female | Age (years) | Mean | SD | ||||
| A | 40 dyads | 40 | 18 | 22 | 25–41 | 32.63 | 4.32 | |
| B | 22 mothers | 22 | 9 | 13 | 25–41 | 32.77 | 4.40 | |
| C | 30 infants | 30 | 14 | 16 | 25–41 | 33.07 | 4.22 | |
| Younger | 16 infants | 16 | 8 | 8 | 25–41 | 33.69 | 4.08 | |
| Older | 14 infants | 14 | 6 | 8 | 26–40 | 32.36 | 4.41 | |
| D | 19 dyads | 19 | 8 | 11 | 25–41 | 32.84 | 4.35 | |
| Younger | 11 infants | 11 | 5 | 6 | 25–41 | 33.36 | 4.54 | |
| Older | 8 infants | 8 | 3 | 5 | 29–40 | 32.13 | 4.26 | |
A: Recruited participants, B: mothers with complete data, C: infants with complete data and D: dyads with complete data.