condition mean min max ZT0-3 1.1217885 1.1217885 1.1217885 ZT4-7 0.8296215 0.8296215 0.8296215 ZT8-11 3.04147 3.04147 3.04147 ZT12-15 5.631485 5.631485 5.631485 ZT16-19 3.663345 3.663345 3.663345 ZT20-23 2.1188000000000002 2.1188000000000002 2.1188000000000002