condition mean min max ZT0-3 32.020745 32.020745 32.020745 ZT4-7 21.54361 21.54361 21.54361 ZT8-11 18.362229 18.362229 18.362229 ZT12-15 23.88019 23.88019 23.88019 ZT16-19 21.696755 21.696755 21.696755 ZT20-23 24.843211500000002 24.843211500000002 24.843211500000002