condition mean min max ZT0-3 1.4119883333333334 0.954145 1.88297 ZT4-7 1.198689 1.198689 1.198689 ZT8-11 0.4570875 0.4570875 0.4570875 ZT12-15 0.93208275 0.7620754999999999 1.10209 ZT16-19 1.0153295 1.0153295 1.0153295 ZT20-23 1.95236 1.95236 1.95236