condition mean min max ZT0-3 0.1852605 0.0 0.370521 ZT4-7 0.77292 0.77292 0.77292 ZT8-11 0.75048 0.75048 0.75048 ZT12-15 0 0 0 ZT16-19 1.8654549999999999 1.8654549999999999 1.8654549999999999 ZT20-23 0.750237 0.750237 0.750237