condition mean min max ZT0-3 248.581828 248.581828 248.581828 ZT4-7 300.3038005 300.3038005 300.3038005 ZT8-11 236.56402150000002 236.56402150000002 236.56402150000002 ZT12-15 348.2824445 348.2824445 348.2824445 ZT16-19 593.748287 593.748287 593.748287 ZT20-23 890.817279 890.817279 890.817279