condition mean min max ZT0-3 2349.528979 2349.528979 2349.528979 ZT4-7 2484.033527 2484.033527 2484.033527 ZT8-11 2393.2171225 2393.2171225 2393.2171225 ZT12-15 1972.840017 1972.840017 1972.840017 ZT16-19 3082.18298 3082.18298 3082.18298 ZT20-23 2589.519838 2589.519838 2589.519838