condition mean min max ZT0-3 17.354367 17.354367 17.354367 ZT4-7 18.0052905 18.0052905 18.0052905 ZT8-11 20.922259 20.922259 20.922259 ZT12-15 17.8255205 17.8255205 17.8255205 ZT16-19 18.715246999999998 18.715246999999998 18.715246999999998 ZT20-23 17.9156385 17.9156385 17.9156385