condition mean min max ZT0-3 13.55 13.55 13.55 ZT4-7 7.6 7.6 7.6 ZT8-11 24.7 24.7 24.7 ZT12-15 7.85 7.85 7.85 ZT16-19 13.3 13.3 13.3 ZT20-23 19.150000000000002 19.150000000000002 19.150000000000002