The phenotypic spectrum of terminal and subterminal 6p deletions based on a social media-derived cohort and literature review

Table 4 Age at achievement of specific milestones

Milestone	Number of individuals^a	Median age of achievement in months (range)
Sitting-up unaided	7	11 (10‒18)
Walking unsupported	17	22 (16‒42)
Building tower of 6 blocks	6	26 (11‒60)
Speaking first words	9	18 (9‒42)
Speaking two-word sentences	6	30 (18‒48)

^aFor calculation of median ages and ranges, we only included individuals for whom the exact ages of achievement of the milestones were known

ISSN: 1750-1172