condition mean min max ZT0-3 1.671545 1.671545 1.671545 ZT4-7 1.0637295 1.0637295 1.0637295 ZT8-11 1.192246 1.192246 1.192246 ZT12-15 1.01246 1.01246 1.01246 ZT16-19 2.634925 2.634925 2.634925 ZT20-23 2.309365 2.309365 2.309365