Development | Infancy | Toddlerhood | Frequency (n) | Percentage (%) |
|---|
Never delayed | No | No | 481 | 38.6 |
Persistently delayed | Yes | Yes | 165 | 13.3 |
Improving | Yes | No | 83 | 6.7 |
Deteriorating | No | Yes | 516 | 41.4 |
- “Never delayed” includes all young children whose scores on the Bayley Scale of Infant Development (BSID) of the Mental Development (MDI) in infancy and toddlerhood never fell below − 1 standard deviation (SD). “Persistently delayed” includes all young children whose scores on the MDI scales in infancy and toddlerhood never rose above − 1 SD. “Improving” includes all young children whose scores on the MDI scales fell below − 1 SD in infancy and then rose above − 1 SD in toddlerhood. “Deteriorating” includes all young children whose scores on the MDI scales were above − 1 SD in infancy and then fell below − 1 SD in toddlerhood. Data source is authors’ survey
