condition mean min max ZT0-3 48.498582 48.498582 48.498582 ZT4-7 67.850889 67.850889 67.850889 ZT8-11 67.2300835 67.2300835 67.2300835 ZT12-15 50.1669745 50.1669745 50.1669745 ZT16-19 73.3999075 73.3999075 73.3999075 ZT20-23 65.374488 65.374488 65.374488