condition mean min max ZT0-3 5.12871 4.61974 5.63768 ZT4-7 6.126795 6.126795 6.126795 ZT8-11 11.56335 11.56335 11.56335 ZT12-15 0 0 0 ZT16-19 12.635349999999999 12.635349999999999 12.635349999999999 ZT20-23 9.034324999999999 9.034324999999999 9.034324999999999