condition mean min max ZT0-3 0.242922 0.242922 0.242922 ZT4-7 0.198314 0.198314 0.198314 ZT8-11 0.5686675 0.5686675 0.5686675 ZT12-15 0.5965465000000001 0.5965465000000001 0.5965465000000001 ZT16-19 0.888949 0.888949 0.888949 ZT20-23 0.0 0.0 0.0