condition mean min max ZT0-3 0.7464778333333333 0.433393 0.9599425 ZT4-7 1.832125 1.832125 1.832125 ZT8-11 2.234165 2.234165 2.234165 ZT12-15 1.9257125 1.1930399999999999 2.658385 ZT16-19 1.011498 1.011498 1.011498 ZT20-23 0.6808730000000001 0.6808730000000001 0.6808730000000001