condition mean min max ZT0-3 3.9148975000000004 3.4842750000000002 4.3455200000000005 ZT4-7 4.50434 4.50434 4.50434 ZT8-11 3.86424 3.86424 3.86424 ZT12-15 0 0 0 ZT16-19 5.410075 5.410075 5.410075 ZT20-23 6.341535 6.341535 6.341535