condition mean min max ZT0-3 0.7286366666666667 0.5955445 0.891656 ZT4-7 0.3839755 0.3839755 0.3839755 ZT8-11 0.557965 0.557965 0.557965 ZT12-15 0.514266 0.510668 0.517864 ZT16-19 0.3097535 0.3097535 0.3097535 ZT20-23 0.42244400000000004 0.42244400000000004 0.42244400000000004