condition mean min max ZT0-3 11.70218 6.27724 16.84945 ZT4-7 7.652675 7.652675 7.652675 ZT8-11 6.056570000000001 6.056570000000001 6.056570000000001 ZT12-15 6.027085 5.24814 6.80603 ZT16-19 9.4647 9.4647 9.4647 ZT20-23 16.445149999999998 16.445149999999998 16.445149999999998