condition mean min max ZT0-3 4.1384050000000006 4.08966 4.18715 ZT4-7 3.895205 3.895205 3.895205 ZT8-11 4.301835 4.301835 4.301835 ZT12-15 0 0 0 ZT16-19 5.2211 5.2211 5.2211 ZT20-23 4.651285 4.651285 4.651285