condition mean min max ZT0-3 0.866323 0.37535050000000003 1.3572955 ZT4-7 1.94339 1.94339 1.94339 ZT8-11 1.349725 1.349725 1.349725 ZT12-15 0 0 0 ZT16-19 1.116345 1.116345 1.116345 ZT20-23 1.55992 1.55992 1.55992