condition mean min max ZT0-3 40.467889 40.467889 40.467889 ZT4-7 39.5050035 39.5050035 39.5050035 ZT8-11 40.4265135 40.4265135 40.4265135 ZT12-15 38.8109975 38.8109975 38.8109975 ZT16-19 48.8856525 48.8856525 48.8856525 ZT20-23 41.817533 41.817533 41.817533