condition mean min max ZT0-3 1.457145 1.2099799999999998 1.70431 ZT4-7 0.918699 0.918699 0.918699 ZT8-11 1.21244 1.21244 1.21244 ZT12-15 0 0 0 ZT16-19 1.54223 1.54223 1.54223 ZT20-23 1.501255 1.501255 1.501255