condition mean min max ZT0-3 27.012539 27.012539 27.012539 ZT4-7 27.650521 27.650521 27.650521 ZT8-11 28.100715 28.100715 28.100715 ZT12-15 28.2114555 28.2114555 28.2114555 ZT16-19 28.0276145 28.0276145 28.0276145 ZT20-23 27.075463499999998 27.075463499999998 27.075463499999998