condition mean min max ZT0-3 0.075719803 0.0 0.151439606 ZT4-7 0.7862804290000001 0.255770108 1.31679075 ZT8-11 1.7841432517500002 1.3032212075 2.2650652960000004 ZT12-15 5.6701358845000005 3.6889011465 7.6513706225 ZT16-19 6.798806251249999 5.685060147 7.9125523555 ZT20-23 8.509290537999998 8.1245690725 8.894012003499999