condition mean min max ZT0-3 0.7696145 0.302066 1.42157 ZT4-7 1.24068 1.24068 1.24068 ZT8-11 1.183111 1.183111 1.183111 ZT12-15 0.63017425 0.4560955 0.804253 ZT16-19 0.5310275 0.5310275 0.5310275 ZT20-23 0.49286050000000003 0.49286050000000003 0.49286050000000003