condition mean min max ZT0-3 24.55 24.55 24.55 ZT4-7 36.5 36.5 36.5 ZT8-11 46.900000000000006 46.900000000000006 46.900000000000006 ZT12-15 51.25 51.25 51.25 ZT16-19 23.4 23.4 23.4 ZT20-23 30.9 30.9 30.9