condition mean min max ZT0-3 18.2044 18.2044 18.2044 ZT4-7 18.21895 18.21895 18.21895 ZT8-11 17.86705 17.86705 17.86705 ZT12-15 15.9252 15.9252 15.9252 ZT16-19 18.5111 18.5111 18.5111 ZT20-23 16.3524 16.3524 16.3524