condition mean min max ZT0-3 54.24065 54.24065 54.24065 ZT4-7 48.87535 48.87535 48.87535 ZT8-11 50.5006 50.5006 50.5006 ZT12-15 49.7677 49.7677 49.7677 ZT16-19 62.7329 62.7329 62.7329 ZT20-23 59.678 59.678 59.678