condition mean min max ZT0-3 23.99365 21.5249 26.4624 ZT4-7 21.326999999999998 21.326999999999998 21.326999999999998 ZT8-11 24.7791 24.7791 24.7791 ZT12-15 0 0 0 ZT16-19 23.2787 23.2787 23.2787 ZT20-23 22.19815 22.19815 22.19815