ITT'S <ITT> HARTFORD UNIT POSTS 4TH QTR GAIN Hartford Insurance Group, a unit of New York-based ITT Corp, said higher worldwide premiums help boost net income for the 1986 fourth quarter to 88.6 mln dlrs, from net income of 36.7 mln dlrs for the 1985 quarter. For the full year, Hartford said it earned 329 mln dlrs, up from 151.4 mln dlrs in 1985. Hartford said results for the year were aided by a gain of 46.5 mln dlrs on the sale of its remaining 52 pct stake in Abbey Life Group PLC. For 1985, the company posted a gain of 14.3 mln dlrs on the sale of 48 pct of Abbey Life. Hartford said total property-casualty and life-health written premiums rose 25 pct in 1986, to eight billion dlrs, from 6.4 billion dlrs in 1985.