condition mean min max ZT0-3 7.064204999999999 7.064204999999999 7.064204999999999 ZT4-7 1.8702649999999998 1.8702649999999998 1.8702649999999998 ZT8-11 2.0948 2.0948 2.0948 ZT12-15 1.697125 1.697125 1.697125 ZT16-19 2.040215 2.040215 2.040215 ZT20-23 9.74602 9.74602 9.74602