condition mean min max ZT0-3 20.55 20.55 20.55 ZT4-7 26.4 26.4 26.4 ZT8-11 36.75 36.75 36.75 ZT12-15 37.900000000000006 37.900000000000006 37.900000000000006 ZT16-19 48.75 48.75 48.75 ZT20-23 30.1 30.1 30.1