condition mean min max ZT0-3 6.348225 6.210435 6.486015 ZT4-7 5.726935 5.726935 5.726935 ZT8-11 11.02695 11.02695 11.02695 ZT12-15 0 0 0 ZT16-19 15.5897 15.5897 15.5897 ZT20-23 9.504010000000001 9.504010000000001 9.504010000000001