condition mean min max ZT0-3 13.4159375 11.777025 15.05485 ZT4-7 10.002205 10.002205 10.002205 ZT8-11 6.862855 6.862855 6.862855 ZT12-15 0 0 0 ZT16-19 5.0021450000000005 5.0021450000000005 5.0021450000000005 ZT20-23 8.761595 8.761595 8.761595