condition mean min max ZT0-3 152.714574 152.714574 152.714574 ZT4-7 154.5412285 154.5412285 154.5412285 ZT8-11 150.90523100000001 150.90523100000001 150.90523100000001 ZT12-15 153.5345345 153.5345345 153.5345345 ZT16-19 144.70820099999997 144.70820099999997 144.70820099999997 ZT20-23 141.82456 141.82456 141.82456