Aetna Inc., the nation's third-largest health insurer, said it would increase its minimum wage to $16 an hour in April. The move would boost the pay of about 5,700 workers, including about 250 in California, according to the company. The average minimum-wage employee will see a pay increase of 11%, and some will get raises of as much as 33%. Beginning in 2016, the Hartford, Conn., insurer also plans to cover more of the healthcare costs of about 7,000 of its workers. Some employees could see savings of up to $4,000, the company said in a statement.