condition mean min max ZT0-3 6.145160000000001 6.145160000000001 6.145160000000001 ZT4-7 6.332585 6.332585 6.332585 ZT8-11 4.50464 4.50464 4.50464 ZT12-15 4.94819 4.94819 4.94819 ZT16-19 5.93701 5.93701 5.93701 ZT20-23 6.31393 6.31393 6.31393