condition mean min max ZT0-3 6.2233325 5.793075 6.65359 ZT4-7 6.208130000000001 6.208130000000001 6.208130000000001 ZT8-11 3.81733 3.81733 3.81733 ZT12-15 0 0 0 ZT16-19 5.763705 5.763705 5.763705 ZT20-23 6.527675 6.527675 6.527675