condition mean min max ZT0-3 0.2493275 0.2493275 0.2493275 ZT4-7 0.1398275 0.1398275 0.1398275 ZT8-11 1.085337 1.085337 1.085337 ZT12-15 2.17493 2.17493 2.17493 ZT16-19 2.59251 2.59251 2.59251 ZT20-23 0.337548 0.337548 0.337548