condition mean min max ZT0-3 1.2895463333333335 1.22038 1.365575 ZT4-7 1.23141 1.23141 1.23141 ZT8-11 1.80504 1.80504 1.80504 ZT12-15 2.8809175 2.17037 3.591465 ZT16-19 1.79307 1.79307 1.79307 ZT20-23 1.82437 1.82437 1.82437