Instead of discussing imputed attitudes or motives, since the Norway law is already 16 years old, why not look at actual studies of quantitative results on comp

Instead of discussing imputed attitudes or motives, since the Norway law is already 16 years old, why not look at actual studies of quantitative results on company performance? (by company size, sector, age etc.) I found 21.7K publications on Norway’s quota for women on corporate boards https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=Norway%E2%80%99s+quota+for+women+on+corporate+boards+&btnG= https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=Norw... Which are the most authoritative? What were their findings? (on actual company performance metrics, not just on the effect on gender representation on boards or executive search committees, or pay gaps)?