condition mean min max ZT0-3 0.3922483333333333 0.2745535 0.596363 ZT4-7 0.08217674999999999 0.08217674999999999 0.08217674999999999 ZT8-11 0.3783225 0.3783225 0.3783225 ZT12-15 0.6259207499999999 0.5541564999999999 0.697685 ZT16-19 0.701045 0.701045 0.701045 ZT20-23 0.6326240000000001 0.6326240000000001 0.6326240000000001