condition mean min max ZT0-3 37.956825 37.83435 38.0793 ZT4-7 23.537799999999997 23.537799999999997 23.537799999999997 ZT8-11 6.282065 6.282065 6.282065 ZT12-15 0 0 0 ZT16-19 5.971125000000001 5.971125000000001 5.971125000000001 ZT20-23 12.883985 12.883985 12.883985