Protection One Inc., a Lawrence-based provider of monitored security services, reported financial results for the first quarter that included a rise in revenues and an increase in the number of customers it had been able to retain.

But the company also reported a loss of $5.3 million, or 29 cents per share, compared with a loss of $2.5 million, or 14 cents a share, from the same period a year earlier.

The results come after Protection One’s merger last month with Integrated Alarm Services Group, an Albany, N.Y.-based company that also provides monitored security services. That merger will be expected to save the combined company an estimated $11 million to $13 million a year.