condition mean min max ZT0-3 0.5114058333333333 0.381075 0.70319 ZT4-7 0.67246 0.67246 0.67246 ZT8-11 0.754116 0.754116 0.754116 ZT12-15 0.7240372500000001 0.6622750000000001 0.7857995 ZT16-19 0.3017545 0.3017545 0.3017545 ZT20-23 0.599863 0.599863 0.599863