condition mean min max ZT0-3 24.276566666666668 18.1601 31.78575 ZT4-7 20.93385 20.93385 20.93385 ZT8-11 22.4984 22.4984 22.4984 ZT12-15 37.95605 32.8163 43.0958 ZT16-19 31.29445 31.29445 31.29445 ZT20-23 29.08025 29.08025 29.08025