condition mean min max ZT0-3 552.55 552.55 552.55 ZT4-7 270.5 270.5 270.5 ZT8-11 292.1 292.1 292.1 ZT12-15 329.65 329.65 329.65 ZT16-19 489.85 489.85 489.85 ZT20-23 650.25 650.25 650.25