condition mean min max ZT0-3 0.5407018333333333 0.0 1.1804355 ZT4-7 0.0 0.0 0.0 ZT8-11 0.347737 0.347737 0.347737 ZT12-15 0.503354 0.0 1.006708 ZT16-19 0.166446 0.166446 0.166446 ZT20-23 0.2896895 0.2896895 0.2896895