condition mean min max ZT0-3 35.95 35.95 35.95 ZT4-7 31.7 31.7 31.7 ZT8-11 56.150000000000006 56.150000000000006 56.150000000000006 ZT12-15 20.85 20.85 20.85 ZT16-19 18.35 18.35 18.35 ZT20-23 30.6 30.6 30.6