condition mean min max ZT0-3 0.286662 0.286662 0.286662 ZT4-7 0.22805150000000002 0.22805150000000002 0.22805150000000002 ZT8-11 0.2856835 0.2856835 0.2856835 ZT12-15 0.3418965 0.3418965 0.3418965 ZT16-19 0.406179 0.406179 0.406179 ZT20-23 0.2720355 0.2720355 0.2720355