condition mean min max ZT0-3 0.757955 0.757955 0.757955 ZT4-7 5.91405 5.91405 5.91405 ZT8-11 1.475587 1.475587 1.475587 ZT12-15 0.304468 0.304468 0.304468 ZT16-19 0.0420646 0.0420646 0.0420646 ZT20-23 0.04215945 0.04215945 0.04215945