To ensure that all groups received a complete
meal, food with a high vitamin A content was replaced by food
with a low vitamin A content. For example, the vegetable group
received carotene-rich vegetables, low-carotene fruit, and lowretinol
protein sources. The main ingredients in the vegetable, fruit,
and protein-source dishes with high or low vitamin A contents are
shown in Table 1. The size of the side dishes was fixed, whereas the
amount of rice was variable. Duplicate samples of the meals, without
rice, were collected at breakfast during 4 nonconsecutive weeks,
each week at a different school. The groups had been given color
codes to avoid confusion about which dishes should be provided to
which groups. Items such as plates, homework books, and cards to
record consumption were all color coded appropriately.
To ensure that all groups received a completemeal, food with a high vitamin A content was replaced by foodwith a low vitamin A content. For example, the vegetable groupreceived carotene-rich vegetables, low-carotene fruit, and lowretinolprotein sources. The main ingredients in the vegetable, fruit,and protein-source dishes with high or low vitamin A contents areshown in Table 1. The size of the side dishes was fixed, whereas theamount of rice was variable. Duplicate samples of the meals, withoutrice, were collected at breakfast during 4 nonconsecutive weeks,each week at a different school. The groups had been given colorcodes to avoid confusion about which dishes should be provided towhich groups. Items such as plates, homework books, and cards torecord consumption were all color coded appropriately.
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