condition mean min max ZT0-3 7.97184 7.97184 7.97184 ZT4-7 7.0514 7.0514 7.0514 ZT8-11 5.825835 5.825835 5.825835 ZT12-15 7.89224 7.89224 7.89224 ZT16-19 7.92092 7.92092 7.92092 ZT20-23 7.03939 7.03939 7.03939