condition mean min max ZT0-3 3.76225 3.335635 4.188865 ZT4-7 4.316425000000001 4.316425000000001 4.316425000000001 ZT8-11 5.316855 5.316855 5.316855 ZT12-15 0 0 0 ZT16-19 5.88995 5.88995 5.88995 ZT20-23 6.134825 6.134825 6.134825