condition mean min max ZT0-3 5.36437 4.476755 5.86759 ZT4-7 16.117449999999998 16.117449999999998 16.117449999999998 ZT8-11 47.9073 47.9073 47.9073 ZT12-15 23.895400000000002 17.13665 30.65415 ZT16-19 9.581025 9.581025 9.581025 ZT20-23 9.076464999999999 9.076464999999999 9.076464999999999