condition mean min max ZT0-3 11.083809 11.083809 11.083809 ZT4-7 10.4407455 10.4407455 10.4407455 ZT8-11 10.812559 10.812559 10.812559 ZT12-15 9.348117 9.348117 9.348117 ZT16-19 10.458753999999999 10.458753999999999 10.458753999999999 ZT20-23 10.86675 10.86675 10.86675