condition mean min max ZT0-3 5.029389999999999 5.029389999999999 5.029389999999999 ZT4-7 5.85621 5.85621 5.85621 ZT8-11 3.72996 3.72996 3.72996 ZT12-15 4.467895 4.467895 4.467895 ZT16-19 5.641255 5.641255 5.641255 ZT20-23 6.07469 6.07469 6.07469