condition mean min max ZT0-3 0.4010056666666667 0.3069755 0.5662645000000001 ZT4-7 0.362093 0.362093 0.362093 ZT8-11 0.2908495 0.2908495 0.2908495 ZT12-15 0.22293625 0.178615 0.2672575 ZT16-19 0.3970675 0.3970675 0.3970675 ZT20-23 0.4919245 0.4919245 0.4919245