condition mean min max ZT0-3 39.828906 39.828906 39.828906 ZT4-7 57.8640535 57.8640535 57.8640535 ZT8-11 49.162065 49.162065 49.162065 ZT12-15 44.4575255 44.4575255 44.4575255 ZT16-19 53.355286 53.355286 53.355286 ZT20-23 39.91625 39.91625 39.91625