condition mean min max ZT0-3 40.225934 40.225934 40.225934 ZT4-7 29.895873 29.895873 29.895873 ZT8-11 34.5504085 34.5504085 34.5504085 ZT12-15 37.143626499999996 37.143626499999996 37.143626499999996 ZT16-19 48.702745 48.702745 48.702745 ZT20-23 53.9488885 53.9488885 53.9488885