condition mean min max ZT0-3 17.370881 17.370881 17.370881 ZT4-7 11.786456000000001 11.786456000000001 11.786456000000001 ZT8-11 11.401339 11.401339 11.401339 ZT12-15 15.2708665 15.2708665 15.2708665 ZT16-19 11.147971 11.147971 11.147971 ZT20-23 10.2941395 10.2941395 10.2941395