condition mean min max ZT0-3 407.916014 407.916014 407.916014 ZT4-7 301.176467 301.176467 301.176467 ZT8-11 415.64095799999996 415.64095799999996 415.64095799999996 ZT12-15 501.80832150000003 501.80832150000003 501.80832150000003 ZT16-19 951.7093995 951.7093995 951.7093995 ZT20-23 899.2976424999999 899.2976424999999 899.2976424999999