condition mean min max ZT0-3 481.174416 481.174416 481.174416 ZT4-7 734.842316 734.842316 734.842316 ZT8-11 584.5303685 584.5303685 584.5303685 ZT12-15 194.0755925 194.0755925 194.0755925 ZT16-19 292.73021900000003 292.73021900000003 292.73021900000003 ZT20-23 600.9351765 600.9351765 600.9351765