condition mean min max ZT0-3 31.155250000000002 31.155250000000002 31.155250000000002 ZT4-7 20.8821 20.8821 20.8821 ZT8-11 15.33705 15.33705 15.33705 ZT12-15 27.94255 27.94255 27.94255 ZT16-19 36.0857 36.0857 36.0857 ZT20-23 38.728350000000006 38.728350000000006 38.728350000000006