condition mean min max ZT0-3 40.251333333333335 26.3767 48.4002 ZT4-7 31.48645 31.48645 31.48645 ZT8-11 19.0904 19.0904 19.0904 ZT12-15 35.232575 32.1562 38.308949999999996 ZT16-19 41.83095 41.83095 41.83095 ZT20-23 58.1957 58.1957 58.1957