condition mean min max ZT0-3 555.65 555.65 555.65 ZT4-7 243.4 243.4 243.4 ZT8-11 333.65 333.65 333.65 ZT12-15 540.2 540.2 540.2 ZT16-19 804.1500000000001 804.1500000000001 804.1500000000001 ZT20-23 964.75 964.75 964.75