condition mean min max ZT0-3 0.335206 0.2927025 0.3777095 ZT4-7 0.4847825 0.4847825 0.4847825 ZT8-11 0.8103695 0.8103695 0.8103695 ZT12-15 0 0 0 ZT16-19 0.398404 0.398404 0.398404 ZT20-23 0.3211345 0.3211345 0.3211345