Private sector employment growth was a bit better than expected in March, but health care and construction continued to provide nearly all the momentum, payrolls processing company ADP reported Wednesday. Job growth totaled 62,000 for the month, down just 4,000 from February's upwardly revised level but above the Dow Jones consensus for 39,000. ADP's report does not include government employees. Like February's report, two sectors essentially provided all the gains. Education and health