condition mean min max ZT0-3 1455.532076 1455.532076 1455.532076 ZT4-7 1128.40091 1128.40091 1128.40091 ZT8-11 639.2978495 639.2978495 639.2978495 ZT12-15 550.9364330000001 550.9364330000001 550.9364330000001 ZT16-19 546.9008615 546.9008615 546.9008615 ZT20-23 600.098557 600.098557 600.098557