Nearly 1,500 children under the age of 6 tested positive for lead poisoning in 2014, according to the latest numbers from the state Department of Public Health. Overall, the number of lead-poisoned children in Connecticut was about the same in 2014 as in 2013, with the total rising by 9 children. In 2014, 2,284 children under 6 were diagnosed as lead-poisoned, compared with 2,275 in 2013. The numbers are roughly equal because some children diagnosed with lead poisoning are cleared after being treated for it, they turn 6 and so are no longer followed by the state, or their families leave the state. But at a combined hearing of the legislature’s Committees on Children and Public Health on Monday, a state Department of Public Health official conceded that those numbers and other state lead statistics may be misleading because of the deficiencies of lead screening in Connecticut.