condition mean min max ZT0-3 24.9 24.9 24.9 ZT4-7 26.5 26.5 26.5 ZT8-11 32.150000000000006 32.150000000000006 32.150000000000006 ZT12-15 18.55 18.55 18.55 ZT16-19 10.9 10.9 10.9 ZT20-23 23.6 23.6 23.6