condition mean min max ZT0-3 0.03508785 0.03508785 0.03508785 ZT4-7 3.61612 3.61612 3.61612 ZT8-11 8.55045 8.55045 8.55045 ZT12-15 0.418871 0.418871 0.418871 ZT16-19 0.18683349999999999 0.18683349999999999 0.18683349999999999 ZT20-23 0.02644185 0.02644185 0.02644185