MINNEAPOLIS -- Health insurer UnitedHealth Group (UNH) said first-quarter profit fell slightly on a decline in investment income and higher costs but still topped analyst expectations.

The Minnetonka, Minn.-based company said earnings fell to $984 million, or 81 cents a share. That's down from $994 million, or 78 cents a share, in last year's first quarter.

Revenue rose to 8.4% to $22 billion as the company added business in government-sponsored and senior plans.

Analysts were expecting earnings of 68 cents a share on revenue of $21.37 billion.

The share of premiums paid out to cover medical claims stayed flat at 82.4%. Enrollment fell slightly.

The company backed its outlook for full-year earnings of $2.90 to $3.15 a share.

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