condition mean min max ZT0-3 0.725929 0.725929 0.725929 ZT4-7 0.401584 0.401584 0.401584 ZT8-11 0.4278375 0.4278375 0.4278375 ZT12-15 1.0079605 1.0079605 1.0079605 ZT16-19 1.322715 1.322715 1.322715 ZT20-23 1.9629050000000001 1.9629050000000001 1.9629050000000001