The Chrono Med-Diet Score is based on eleven food categories, to determine the overall score, based on a daily to weekly intake:
Along these categories, two more were added to further characterize the eating habits and overall health status of the study participants:
A score of 2 points was given to the highest consumption of canonical Mediterranean Diet products (i.e., fruit, vegetables, legumes, fish, and olive oil), whereas a score of 1 point was assigned to the halfway category and a score of 0 points was given to the lowest intake for such products.
On the other hand, meat, meat products, milk and milk-derived products were assigned 2 points when eaten less than 1 time per day to 0 points when eaten more than 1.5 times per day.
Farinaceous products were given 2 points for consumption of one portion per day, whereas -1 point was assigned when eating more than 1.5 portions per day. Time of farinaceous consumption was also considered a standalone category. An intake by 3pm was given 1 point, while by 7pm it was assigned -1 point and -2 points if the farinaceous was eaten in the evening. The combined consumption in both lunch and dinner in the same day was given -4 points. Cereals were assigned 1 point per maximum intake and 0 points for consumption of less than 1 portion per day.
The use of fats such as butter, margarine and lard were assessed by assigning 1 point in case of occasional use, -1 point for frequent use and -2 points for referred regular use. Alcohol intake was carefully considered using alcohol units (1 alcohol unit = 12g of alcohol). A score of three points was assigned to a consumption of <1 U.A. per day, ranging to -2 points assigned to >3 U.A. per day. Regarding extra virgin olive oil (EVOO), the best score was assigned for regular use, whereas occasional use was awarded 0 points. Physical activity was considered following the WHO guidelines, ranging from a score of 3 points for regular physical activity to -3 points in case of rare to none referred activity.