condition mean min max ZT0-3 6.44741 6.44741 6.44741 ZT4-7 6.339029999999999 6.339029999999999 6.339029999999999 ZT8-11 5.822184999999999 5.822184999999999 5.822184999999999 ZT12-15 5.824434999999999 5.824434999999999 5.824434999999999 ZT16-19 7.022915 7.022915 7.022915 ZT20-23 6.5660050000000005 6.5660050000000005 6.5660050000000005