condition mean min max ZT0-3 23.646633333333334 20.0973 25.72335 ZT4-7 28.0071 28.0071 28.0071 ZT8-11 34.9833 34.9833 34.9833 ZT12-15 79.718825 72.3209 87.11675 ZT16-19 125.6115 125.6115 125.6115 ZT20-23 41.88315 41.88315 41.88315