Table 3.
Frequencies of children with SCT delayed in milestones according to ages set by CDC Milestones checklists.
| Milestone | Age | XXY (Total N = 174) | XYY (Total N = 50) | XXX (Total N = 74), |
|---|---|---|---|---|
|
| ||||
| Language | ||||
|
| ||||
| Cooing | 4 months | 16/165 (9.7%) | 13/46 (28.3%) | 11/68 (16.2%) |
| Babbling | 9 months | 35/158 (22.12%) | 9/44 (20.5%) | 13/61 (21.3%) |
| First Words | 15 months | 32/1582 (21.1%) | 8/36 (22.2%) | 10/55 (18.2%) |
| 2 Word Phrases | 24 months | 33/135 (24.4%) | 9/33 (39.1%) | 10/42 (23.8%) |
| Motor | ||||
|
| ||||
| Rolling Front to Back | 6 months | 17/162 (10.5%) | 7/44 (15.9%) | 9/64 (14.1%) |
| Sitting Independently | 9 months | 3/164 (1.8%) | 1/45 (2.2%) | 2/60 (3.3%) |
| Cruising | 12 months | 22/157 (14%) | 3/41 (7.3%) | 13/62 (21%) |
| Walking | 15 months | 33/156 (21.2%) | 7/32 (21.9%) | 19/53 (35.9%) |
| Running | 24 months | 12/145 (8.3%) | 1/27 (3.7%) | 4/51 (7.8%) |
| Jumping | 30 months | 22/131 (16.8%) | 6/22 (27.3%) | 7/43 (16.3%) |
N (%; p-value): Number (%) of children in each trisomy that achieved the milestone later than the ages listed on CDC milestone checklists. Total sample sizes differ for each milestone and trisomy.
CDC cut points were not available for rolling back to front and crawling