condition mean min max ZT0-3 17.7132 17.7132 17.7132 ZT4-7 16.708 16.708 16.708 ZT8-11 17.21165 17.21165 17.21165 ZT12-15 19.16055 19.16055 19.16055 ZT16-19 23.59745 23.59745 23.59745 ZT20-23 17.873350000000002 17.873350000000002 17.873350000000002