condition mean min max ZT0-3 11.37905 11.37905 11.37905 ZT4-7 12.113465 12.113465 12.113465 ZT8-11 7.912435 7.912435 7.912435 ZT12-15 6.763805 6.763805 6.763805 ZT16-19 1.7277200000000001 1.7277200000000001 1.7277200000000001 ZT20-23 8.28641 8.28641 8.28641