condition mean min max ZT0-3 0.0232428 0.0232428 0.0232428 ZT4-7 0.0311844 0.0311844 0.0311844 ZT8-11 0.0348422 0.0348422 0.0348422 ZT12-15 0.0412502 0.0412502 0.0412502 ZT16-19 0.02776705 0.02776705 0.02776705 ZT20-23 0.09743785 0.09743785 0.09743785