condition mean min max ZT0-3 11.100000000000001 11.100000000000001 11.100000000000001 ZT4-7 48.6 48.6 48.6 ZT8-11 18.85 18.85 18.85 ZT12-15 37.3 37.3 37.3 ZT16-19 21.65 21.65 21.65 ZT20-23 16.55 16.55 16.55