condition mean min max ZT0-3 0.670669 0.670669 0.670669 ZT4-7 0.794646 0.794646 0.794646 ZT8-11 0.581169 0.581169 0.581169 ZT12-15 0.39382100000000003 0.39382100000000003 0.39382100000000003 ZT16-19 1.120759 1.120759 1.120759 ZT20-23 0.7537929999999999 0.7537929999999999 0.7537929999999999