condition mean min max ZT0-3 1273.597674 1273.597674 1273.597674 ZT4-7 1335.974052 1335.974052 1335.974052 ZT8-11 1335.8117269999998 1335.8117269999998 1335.8117269999998 ZT12-15 1480.51115 1480.51115 1480.51115 ZT16-19 1305.7180885 1305.7180885 1305.7180885 ZT20-23 1475.150298 1475.150298 1475.150298