The nation’s CEOs are increasingly less confident about economic conditions, and most do not see profits improving in the coming year, according to The Conference Board Measure of CEO Confidence. The index, which had stood at 53 points in the first quarter, dropped to 45 points this quarter. A reading greater than 50 points reflects more positive than negative views of the economy. Only 17 percent of business leaders expect economic conditions to improve in the next six months, down from 27 percent earlier this year.