condition mean min max ZT0-3 23.405273333333334 8.07722 32.0437 ZT4-7 10.492840000000001 10.492840000000001 10.492840000000001 ZT8-11 9.202455 9.202455 9.202455 ZT12-15 15.821024999999999 15.785499999999999 15.856549999999999 ZT16-19 21.56785 21.56785 21.56785 ZT20-23 37.4649 37.4649 37.4649