condition mean min max ZT0-3 14.87845 14.87845 14.87845 ZT4-7 9.726895 9.726895 9.726895 ZT8-11 9.167 9.167 9.167 ZT12-15 13.79565 13.79565 13.79565 ZT16-19 17.5879 17.5879 17.5879 ZT20-23 18.03665 18.03665 18.03665