condition mean min max ZT0-3 39.8665 39.8665 39.8665 ZT4-7 30.7615 30.7615 30.7615 ZT8-11 38.2051 38.2051 38.2051 ZT12-15 36.71705 36.71705 36.71705 ZT16-19 45.908550000000005 45.908550000000005 45.908550000000005 ZT20-23 45.2826 45.2826 45.2826