condition mean min max ZT0-3 3.81876 3.101085 4.521015 ZT4-7 3.82582 3.82582 3.82582 ZT8-11 6.11847 6.11847 6.11847 ZT12-15 6.2112175 5.829785 6.59265 ZT16-19 6.008915 6.008915 6.008915 ZT20-23 4.36433 4.36433 4.36433