condition mean min max ZT0-3 31.5346 31.5346 31.5346 ZT4-7 23.5624 23.5624 23.5624 ZT8-11 26.83645 26.83645 26.83645 ZT12-15 28.8689 28.8689 28.8689 ZT16-19 34.0554 34.0554 34.0554 ZT20-23 24.4391 24.4391 24.4391