condition mean min max ZT0-3 97.760227 97.760227 97.760227 ZT4-7 68.4425215 68.4425215 68.4425215 ZT8-11 64.60428950000001 64.60428950000001 64.60428950000001 ZT12-15 64.824559 64.824559 64.824559 ZT16-19 57.6963465 57.6963465 57.6963465 ZT20-23 57.001594 57.001594 57.001594