condition mean min max ZT0-3 27.34 26.19675 28.483249999999998 ZT4-7 28.919249999999998 28.919249999999998 28.919249999999998 ZT8-11 27.064549999999997 27.064549999999997 27.064549999999997 ZT12-15 0 0 0 ZT16-19 25.2911 25.2911 25.2911 ZT20-23 29.29315 29.29315 29.29315