Figure 3

Developmental status. The orange, green, yellow, and blue bars represent the period before head control, the period after head control and before sitting without support, the period after sitting without support and before walking without support, and the period after walking without support, respectively. The gray bars denote the period with no information. DQ, developmental quotient; IQ, intellectual quotient; N.E., not examined; Age, age at the last examination or at death; and GA, gestational age.