condition mean min max ZT0-3 10.252725 10.252725 10.252725 ZT4-7 7.9627 7.9627 7.9627 ZT8-11 10.23701 10.23701 10.23701 ZT12-15 11.4108 11.4108 11.4108 ZT16-19 15.466099999999999 15.466099999999999 15.466099999999999 ZT20-23 10.76391 10.76391 10.76391