condition mean min max ZT0-3 22.99575 17.43935 26.648600000000002 ZT4-7 18.9442 18.9442 18.9442 ZT8-11 13.1495 13.1495 13.1495 ZT12-15 15.74015 15.269950000000001 16.21035 ZT16-19 17.0233 17.0233 17.0233 ZT20-23 24.735149999999997 24.735149999999997 24.735149999999997