condition mean min max ZT0-3 894.530185 894.530185 894.530185 ZT4-7 561.7211935 561.7211935 561.7211935 ZT8-11 634.684347 634.684347 634.684347 ZT12-15 760.1235059999999 760.1235059999999 760.1235059999999 ZT16-19 743.188032 743.188032 743.188032 ZT20-23 846.879167 846.879167 846.879167