Actually this is Fuzzy Stats. But we have the fuzzy Math series active.
Testing was done on 35 little rascals at age 6 months. Testing done every 3 months. Kids placed near toys. Those who showed preference for using right hand early - 6 months - were Labelle early right or late right. Ditto left.
They found the kids who were early decision makers spoke earlier than late left or right. By earlier means at 15 months I think.
12 were early right. 8 late right. 12 late left. Or so like that. Speech fluency test done only at one time.
So sample size miniscule. Testing of fluency done at only 1 time. Useless study IMO.
Source today. Wsj