condition mean min max ZT0-3 64.782905 64.782905 64.782905 ZT4-7 261.6455705 261.6455705 261.6455705 ZT8-11 245.50386749999998 245.50386749999998 245.50386749999998 ZT12-15 182.31143250000002 182.31143250000002 182.31143250000002 ZT16-19 292.7364715 292.7364715 292.7364715 ZT20-23 164.8071875 164.8071875 164.8071875