condition mean min max ZT0-3 0.7151405 0.3591365 0.896015 ZT4-7 0.841446 0.841446 0.841446 ZT8-11 0.34322 0.34322 0.34322 ZT12-15 1.3377862500000002 0.8833975000000001 1.792175 ZT16-19 1.96022 1.96022 1.96022 ZT20-23 1.8560949999999998 1.8560949999999998 1.8560949999999998