condition mean min max ZT0-3 17.627741666666665 8.571674999999999 22.54625 ZT4-7 7.52976 7.52976 7.52976 ZT8-11 9.040675 9.040675 9.040675 ZT12-15 18.731425 16.35 21.11285 ZT16-19 21.5227 21.5227 21.5227 ZT20-23 24.8521 24.8521 24.8521