condition mean min max ZT0-3 5.275055 5.191845000000001 5.358265 ZT4-7 16.38045 16.38045 16.38045 ZT8-11 7.74541 7.74541 7.74541 ZT12-15 0 0 0 ZT16-19 1.666515 1.666515 1.666515 ZT20-23 4.884835 4.884835 4.884835