condition mean min max ZT0-3 0.857834 0.5144955 1.1078350000000001 ZT4-7 0.90692 0.90692 0.90692 ZT8-11 0.3288316 0.3288316 0.3288316 ZT12-15 0.2668915 0.2210665 0.3127165 ZT16-19 0.33055100000000004 0.33055100000000004 0.33055100000000004 ZT20-23 0.2778965 0.2778965 0.2778965