condition mean min max ZT0-3 2.891255 1.6362100000000002 4.1463 ZT4-7 2.068775 2.068775 2.068775 ZT8-11 3.746515 3.746515 3.746515 ZT12-15 0 0 0 ZT16-19 2.4483065 2.4483065 2.4483065 ZT20-23 2.45741 2.45741 2.45741