condition mean min max ZT0-3 323.966731 323.966731 323.966731 ZT4-7 189.22132399999998 189.22132399999998 189.22132399999998 ZT8-11 195.7384485 195.7384485 195.7384485 ZT12-15 258.962826 258.962826 258.962826 ZT16-19 430.3557175 430.3557175 430.3557175 ZT20-23 363.000226 363.000226 363.000226