condition mean min max ZT0-3 1.35972975 1.1945044999999999 1.524955 ZT4-7 1.6695799999999998 1.6695799999999998 1.6695799999999998 ZT8-11 2.7822449999999996 2.7822449999999996 2.7822449999999996 ZT12-15 0 0 0 ZT16-19 2.01066 2.01066 2.01066 ZT20-23 1.437805 1.437805 1.437805