condition mean min max ZT0-3 1429.0883333333334 1179.1 1881.255 ZT4-7 791.2574999999999 791.2574999999999 791.2574999999999 ZT8-11 155.93599999999998 155.93599999999998 155.93599999999998 ZT12-15 97.25274999999999 72.53565 121.96985 ZT16-19 69.1602 69.1602 69.1602 ZT20-23 250.2105 250.2105 250.2105