condition mean min max ZT0-3 0.5533341 0.5533341 0.5533341 ZT4-7 0.7557655 0.7557655 0.7557655 ZT8-11 0.21925719999999999 0.21925719999999999 0.21925719999999999 ZT12-15 0.25035975 0.25035975 0.25035975 ZT16-19 0.3016906 0.3016906 0.3016906 ZT20-23 0.7051415333333333 0.7051415333333333 0.7051415333333333