condition mean min max ZT0-3 9.167045 9.167045 9.167045 ZT4-7 9.3764085 9.3764085 9.3764085 ZT8-11 10.6389755 10.6389755 10.6389755 ZT12-15 11.160488 11.160488 11.160488 ZT16-19 10.733658 10.733658 10.733658 ZT20-23 11.413161500000001 11.413161500000001 11.413161500000001