condition mean min max ZT0-3 59.340011 59.340011 59.340011 ZT4-7 43.9805665 43.9805665 43.9805665 ZT8-11 53.462886999999995 53.462886999999995 53.462886999999995 ZT12-15 83.2877355 83.2877355 83.2877355 ZT16-19 78.7192345 78.7192345 78.7192345 ZT20-23 77.51266 77.51266 77.51266