condition mean min max ZT0-3 176.124559 176.124559 176.124559 ZT4-7 156.575949 156.575949 156.575949 ZT8-11 125.45396149999999 125.45396149999999 125.45396149999999 ZT12-15 145.2978085 145.2978085 145.2978085 ZT16-19 152.108877 152.108877 152.108877 ZT20-23 234.04993 234.04993 234.04993