condition mean min max ZT0-3 9.578009 9.578009 9.578009 ZT4-7 10.551579499999999 10.551579499999999 10.551579499999999 ZT8-11 9.7318305 9.7318305 9.7318305 ZT12-15 10.391312 10.391312 10.391312 ZT16-19 10.8526575 10.8526575 10.8526575 ZT20-23 11.374595 11.374595 11.374595