condition mean min max ZT0-3 0.11736666666666667 0.0 0.3521 ZT4-7 0.0 0.0 0.0 ZT8-11 0.083654 0.083654 0.083654 ZT12-15 0.0449755 0.0 0.089951 ZT16-19 0.327534 0.327534 0.327534 ZT20-23 0.0 0.0 0.0