condition mean min max ZT0-3 20.650000000000002 20.650000000000002 20.650000000000002 ZT4-7 34.3 34.3 34.3 ZT8-11 36.55 36.55 36.55 ZT12-15 11.2 11.2 11.2 ZT16-19 40.900000000000006 40.900000000000006 40.900000000000006 ZT20-23 24.75 24.75 24.75