The effects of expanding the generosity of statutory sick leave insurance: The case of a French reform

•First part of the reform: reduction of the waiting period from ten to seven days.•Second part of the reform: reduction of minimum required tenure, from three years to one year.•New database of collective bargaining agreements to identify complementary benefit sick leave.•Reduction of the waiting period significantly increases the number of sick days.•The second part of the reform had a bigger impact than the first part.