condition mean min max ZT0-3 800.660582 800.660582 800.660582 ZT4-7 720.181967 720.181967 720.181967 ZT8-11 580.478102 580.478102 580.478102 ZT12-15 489.68257100000005 489.68257100000005 489.68257100000005 ZT16-19 474.512341 474.512341 474.512341 ZT20-23 434.608184 434.608184 434.608184