condition mean min max ZT0-3 49.51675 49.51675 49.51675 ZT4-7 25.53305 25.53305 25.53305 ZT8-11 22.5054 22.5054 22.5054 ZT12-15 39.973349999999996 39.973349999999996 39.973349999999996 ZT16-19 57.35065 57.35065 57.35065 ZT20-23 63.162000000000006 63.162000000000006 63.162000000000006