condition mean min max ZT0-3 44.43285 44.43285 44.43285 ZT4-7 36.1328 36.1328 36.1328 ZT8-11 29.32655 29.32655 29.32655 ZT12-15 31.57155 31.57155 31.57155 ZT16-19 48.91865 48.91865 48.91865 ZT20-23 45.5722 45.5722 45.5722