condition mean min max ZT0-3 98.615751 98.615751 98.615751 ZT4-7 54.7988685 54.7988685 54.7988685 ZT8-11 44.0697885 44.0697885 44.0697885 ZT12-15 48.8989065 48.8989065 48.8989065 ZT16-19 62.9036925 62.9036925 62.9036925 ZT20-23 61.278239 61.278239 61.278239