condition mean min max ZT0-3 68.162071 68.162071 68.162071 ZT4-7 89.3004075 89.3004075 89.3004075 ZT8-11 77.34246350000001 77.34246350000001 77.34246350000001 ZT12-15 72.69106099999999 72.69106099999999 72.69106099999999 ZT16-19 89.4482965 89.4482965 89.4482965 ZT20-23 88.499314 88.499314 88.499314