condition mean min max ZT0-3 0.652244 0.652244 0.652244 ZT4-7 0.6792355 0.6792355 0.6792355 ZT8-11 0.6444920000000001 0.6444920000000001 0.6444920000000001 ZT12-15 0.6250020000000001 0.6250020000000001 0.6250020000000001 ZT16-19 0.6852346666666667 0.6852346666666667 0.6852346666666667 ZT20-23 0.9841899999999999 0.9841899999999999 0.9841899999999999