condition mean min max ZT0-3 21.747337 21.747337 21.747337 ZT4-7 23.717906 23.717906 23.717906 ZT8-11 23.788908 23.788908 23.788908 ZT12-15 24.5488845 24.5488845 24.5488845 ZT16-19 26.4657745 26.4657745 26.4657745 ZT20-23 18.7049545 18.7049545 18.7049545