condition mean min max ZT0-3 630.318563 630.318563 630.318563 ZT4-7 821.3766255 821.3766255 821.3766255 ZT8-11 899.0559049999999 899.0559049999999 899.0559049999999 ZT12-15 992.9268405 992.9268405 992.9268405 ZT16-19 740.9575195 740.9575195 740.9575195 ZT20-23 742.4562935 742.4562935 742.4562935