condition mean min max ZT0-3 61.046375 54.11685 67.9759 ZT4-7 41.479749999999996 41.479749999999996 41.479749999999996 ZT8-11 29.46765 29.46765 29.46765 ZT12-15 0 0 0 ZT16-19 44.9356 44.9356 44.9356 ZT20-23 52.4149 52.4149 52.4149