condition mean min max ZT0-3 59.87285000000001 47.78005 82.4985 ZT4-7 39.83155 39.83155 39.83155 ZT8-11 9.682065000000001 9.682065000000001 9.682065000000001 ZT12-15 22.89595 20.9888 24.8031 ZT16-19 13.8137 13.8137 13.8137 ZT20-23 22.68175 22.68175 22.68175