condition mean min max ZT0-3 5.75377 4.393105 6.890969999999999 ZT4-7 4.4778 4.4778 4.4778 ZT8-11 4.1438 4.1438 4.1438 ZT12-15 3.848535 3.6756900000000003 4.02138 ZT16-19 5.64288 5.64288 5.64288 ZT20-23 6.951029999999999 6.951029999999999 6.951029999999999