condition mean min max ZT0-3 9.06397 9.06397 9.06397 ZT4-7 10.3372085 10.3372085 10.3372085 ZT8-11 9.829792 9.829792 9.829792 ZT12-15 8.535571000000001 8.535571000000001 8.535571000000001 ZT16-19 8.972493 8.972493 8.972493 ZT20-23 9.4855175 9.4855175 9.4855175