condition mean min max ZT0-3 26.305471458333333 24.380921606666668 28.230021309999998 ZT4-7 22.191690235 19.708585709999998 24.67479476 ZT8-11 25.099149383333334 23.42143524 26.776863526666666 ZT12-15 14.451131494 12.11133397 16.790929018 ZT16-19 13.53422383 13.43920206 13.6292456 ZT20-23 11.875235986166667 10.635079683 13.115392289333332