condition mean min max ZT0-3 316.102051 316.102051 316.102051 ZT4-7 362.49469799999997 362.49469799999997 362.49469799999997 ZT8-11 396.762843 396.762843 396.762843 ZT12-15 308.4948615 308.4948615 308.4948615 ZT16-19 546.8585935 546.8585935 546.8585935 ZT20-23 631.813275 631.813275 631.813275