condition mean min max ZT0-3 1803.49513 1803.49513 1803.49513 ZT4-7 1800.669537 1800.669537 1800.669537 ZT8-11 1856.4865255 1856.4865255 1856.4865255 ZT12-15 1673.1473925 1673.1473925 1673.1473925 ZT16-19 1684.4024795 1684.4024795 1684.4024795 ZT20-23 1939.442441 1939.442441 1939.442441