condition mean min max ZT0-3 3.66296 2.38001 4.94591 ZT4-7 6.176159999999999 6.176159999999999 6.176159999999999 ZT8-11 7.95646 7.95646 7.95646 ZT12-15 0 0 0 ZT16-19 12.9144 12.9144 12.9144 ZT20-23 5.379255 5.379255 5.379255