condition mean min max ZT0-3 44.048963889999996 43.83856256 44.25936522 ZT4-7 53.1537366 52.8545537 53.4529195 ZT8-11 55.70340816666667 55.238203623333334 56.168612710000005 ZT12-15 54.333405235 53.536872726666665 55.12993774333333 ZT16-19 56.667693715 54.89928814 58.43609929 ZT20-23 51.34222616833333 50.98899935666667 51.69545298