condition mean min max ZT0-3 83.696175 79.3912 88.00115 ZT4-7 81.3365 81.3365 81.3365 ZT8-11 171.0685 171.0685 171.0685 ZT12-15 0 0 0 ZT16-19 176.2395 176.2395 176.2395 ZT20-23 128.57299999999998 128.57299999999998 128.57299999999998