condition mean min max ZT0-3 1.35564 1.2353049999999999 1.475975 ZT4-7 1.676685 1.676685 1.676685 ZT8-11 1.7504300000000002 1.7504300000000002 1.7504300000000002 ZT12-15 0 0 0 ZT16-19 1.6838450000000003 1.6838450000000003 1.6838450000000003 ZT20-23 1.41176 1.41176 1.41176