condition mean min max ZT0-3 10.829067 10.829067 10.829067 ZT4-7 10.8734065 10.8734065 10.8734065 ZT8-11 10.6869415 10.6869415 10.6869415 ZT12-15 10.829067 10.829067 10.829067 ZT16-19 10.870806 10.870806 10.870806 ZT20-23 10.294933 10.294933 10.294933