condition mean min max ZT0-3 29.55755 29.5539 29.5612 ZT4-7 21.231299999999997 21.231299999999997 21.231299999999997 ZT8-11 19.12295 19.12295 19.12295 ZT12-15 0 0 0 ZT16-19 26.081449999999997 26.081449999999997 26.081449999999997 ZT20-23 25.78915 25.78915 25.78915