condition mean min max ZT0-3 45.199775 41.9353 48.46425 ZT4-7 84.24369999999999 84.24369999999999 84.24369999999999 ZT8-11 50.5017 50.5017 50.5017 ZT12-15 0 0 0 ZT16-19 47.875600000000006 47.875600000000006 47.875600000000006 ZT20-23 65.4321 65.4321 65.4321