condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.071536 0.0678465 0.0752255 ZT16-19 0.12787785 0.12787785 0.12787785 ZT20-23 0.0 0.0 0.0