condition mean min max ZT0-3 14.760725 14.66355 14.8579 ZT4-7 12.96105 12.96105 12.96105 ZT8-11 9.7935 9.7935 9.7935 ZT12-15 0 0 0 ZT16-19 13.4936 13.4936 13.4936 ZT20-23 13.6904 13.6904 13.6904