condition mean min max ZT0-3 639.55 639.55 639.55 ZT4-7 489.6 489.6 489.6 ZT8-11 507.95000000000005 507.95000000000005 507.95000000000005 ZT12-15 625.0 625.0 625.0 ZT16-19 606.65 606.65 606.65 ZT20-23 733.75 733.75 733.75