condition mean min max ZT0-3 34.95146666666667 27.39975 39.10665 ZT4-7 33.9009 33.9009 33.9009 ZT8-11 48.3595 48.3595 48.3595 ZT12-15 55.38335 48.341 62.4257 ZT16-19 47.15085 47.15085 47.15085 ZT20-23 47.9451 47.9451 47.9451