condition mean min max ZT0-3 19266.35 19266.35 19266.35 ZT4-7 19658.4 19658.4 19658.4 ZT8-11 18706.55 18706.55 18706.55 ZT12-15 18278.3 18278.3 18278.3 ZT16-19 19742.75 19742.75 19742.75 ZT20-23 18882.65 18882.65 18882.65