condition mean min max ZT0-3 11.44455 11.44455 11.44455 ZT4-7 6.506615 6.506615 6.506615 ZT8-11 5.44636 5.44636 5.44636 ZT12-15 8.34829 8.34829 8.34829 ZT16-19 13.5679 13.5679 13.5679 ZT20-23 14.4193 14.4193 14.4193