Total online job ads were 4,365,000 in April, an increase of 610,600 or 16 percent from March, according to The Conference Board Help-Wanted OnLine Data Series. Part of the rise reflects seasonal factors including the longer reference period of mid-March to mid-April, when there were three more days than in the previous month. There were 2.9 advertised vacancies online for every 100 persons in the labor force in April. Over the year April '06 - April '07, online advertised vacancies increased 24 percent for the nation as a whole. In April, the occupations with the most advertised online vacancies nationally were management (476,200) and healthcare practitioner and technical (374,700). "Employers are actively looking for the right workers and a relatively tight labor market is forcing them to maintain aggressive advertising plans," said Gad Levanon, economist at The Conference Board. "Business sentiment edged up in the first quarter and these indications about hiring plans early in the second quarter suggest business sentiment is continuing to pick up. The April rise in advertised vacancies reflects some momentum in the labor market, which in turn reflects an economy that is slow but not slowing."