condition mean min max ZT0-3 0.176833725 0.17509845 0.178569 ZT4-7 0.265921 0.265921 0.265921 ZT8-11 0.73881 0.73881 0.73881 ZT12-15 0 0 0 ZT16-19 0.3887315 0.3887315 0.3887315 ZT20-23 0.4411265 0.4411265 0.4411265