condition mean min max ZT0-3 139.114206 139.114206 139.114206 ZT4-7 155.88878 155.88878 155.88878 ZT8-11 182.03888949999998 182.03888949999998 182.03888949999998 ZT12-15 136.9972545 136.9972545 136.9972545 ZT16-19 193.7154135 193.7154135 193.7154135 ZT20-23 187.539255 187.539255 187.539255