Starting formal schooling too early — being in first grade before age 6 — is a risk factor for earlier mortality.

过早接受正式教育(6岁以前上一年级)是提前死亡的危险因素。

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Commercial grade is also led to significantly improve an important factor in housing prices.

商业级也是导致显着改善的一个重要因素住房价格。

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For patients with PE secondary to a transient (reversible) risk factor, we recommend treatment with a VKA for 3 months over treatment for shorter periods (Grade 1a).

暂时性(可逆性)危险因素继发pe患者，我们推荐VKA治疗疗程为3个月，而不是更短疗程(1 A)。

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Is grade inflation an important factor in the decline in student work effort?

FORBES: The Three "I's" of Higher Ed Reform

The age of pupils can be another determining factor: under-age pupils are more likely to repeat a grade, while over-age pupils tend to leave school early.

UNESCO: MEDIA SERVICES