Feb 19 (Reuters) - Donegal Group Inc DGICA.O :
* Announces significantly improved fourth quarter and full year 2015 results
* Qtrly operating income per class a share $0.25
* Qtrly diluted net income per class a share $0.28
* Qtrly total revenues $163.8 million versus $151.6 million
* Qtrly operating income per class b share $0.23
* Qtrly diluted net income per class a share $0.25
* Says book value per share of $15.66 at December 31, 2015, compared to $15.40
at year-end 2014
* Source text for Eikon ID:nGNXMMJZEa
* Further company coverage DGICA.O
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