condition mean min max ZT0-3 430.302066875 381.5975093 479.00662444999995 ZT4-7 405.473841125 394.27306085 416.6746214 ZT8-11 239.8695587275 187.62204795499997 292.1170695 ZT12-15 57.5656540325 53.49452375 61.636784315 ZT16-19 147.7434093525 127.19659830500001 168.2902204 ZT20-23 207.8746746 203.03171595 212.71763325