condition mean min max ZT0-3 2.1541170000000003 1.6259860000000002 2.6051 ZT4-7 1.582725 1.582725 1.582725 ZT8-11 2.3485500000000004 2.3485500000000004 2.3485500000000004 ZT12-15 4.57033 3.949775 5.190885 ZT16-19 6.198985 6.198985 6.198985 ZT20-23 4.6097 4.6097 4.6097