condition mean min max ZT0-3 1.819502725 0.0 3.63900545 ZT4-7 0.573626667 0.0 1.147253334 ZT8-11 0.0 0.0 0.0 ZT12-15 1.0996035263333332 1.0620280896666665 1.137178963 ZT16-19 0.9410888485000001 0.0 1.8821776970000001 ZT20-23 0.5042037613333333 0.0 1.0084075226666667