condition mean min max ZT0-3 26.591844 26.591844 26.591844 ZT4-7 27.2571235 27.2571235 27.2571235 ZT8-11 45.83466 45.83466 45.83466 ZT12-15 29.884895 29.884895 29.884895 ZT16-19 26.5469455 26.5469455 26.5469455 ZT20-23 23.134248999999997 23.134248999999997 23.134248999999997