01-003 · EVIDENCE B · SOURCE-SENSITIVE
Install smoke alarms; those heating with coal or gas in winter should also add a carbon monoxide alarm
装烟雾报警器；冬天在室内烧煤、用燃气取暖的再装一氧化碳报警器
A smoke alarm costs between 30 and 100 yuan. A carbon monoxide alarm costs between 50 and 150 yuan. After installation, the batteries need to be replaced once a year.
A properly functioning smoke alarm can cut the risk of dying in a home fire by roughly 60%. Forty percent of fire victims are asleep at the time, so they won’t wake up just from the smell of smoke. For anyone heating their home with coal or gas during winter, adding a carbon monoxide alarm is essential. In China, 11,500 people died from carbon monoxide poisoning in 2018; 70% of those deaths occurred at home during the three winter months.
B
Move “Install smoke alarms; those heating with coal or gas in winter should also add a carbon monoxide alarm” to Future Me's calendar
The excuse
Future Me has a clearer calendar, more patience, and apparently the same responsibilities.
What feels good now
Today I keep a little money, a few minutes and avoid interrupting my default routine.
What the source says
The source summarizes the return this way: “A properly functioning smoke alarm can cut the risk of dying in a home fire by roughly 60%. Forty percent of fire victims are asleep at the time, so they won’t wake up just from the smell of smoke. For anyone heating their home with coal or gas during winter, adding a carbon monoxide alarm is essential. In China, 11,500 people died from carbon monoxide poisoning in 2018; 70% of those deaths occurred at home during the three winter months.” Evidence grade B. The original states the population, caveats, and sources; this is not a personal forecast.
Use the original facts and limits. For an urgent medical, safety, financial, or legal issue, contact a qualified local professional or service.
THE ENGLISH EDITION
Original recommendation and evidence
3. Install smoke alarms; those heating with coal or gas in winter should also add a carbon monoxide alarm
Cost: A smoke alarm costs between 30 and 100 yuan. A carbon monoxide alarm costs between 50 and 150 yuan. After installation, the batteries need to be replaced once a year.
In plain terms: A properly functioning smoke alarm can cut the risk of dying in a home fire by roughly 60%. Forty percent of fire victims are asleep at the time, so they won’t wake up just from the smell of smoke. For anyone heating their home with coal or gas during winter, adding a carbon monoxide alarm is essential. In China, 11,500 people died from carbon monoxide poisoning in 2018; 70% of those deaths occurred at home during the three winter months.
Benefit: A study in North Carolina examined homes that had experienced fires versus those that hadn’t. It found that having a working smoke alarm lowered the death risk by about 60%. The odds ratio was 0.39, with a 95% confidence interval ranging from 0.18 to 0.83. Between 2018 and 2020, 24% of fatal residential fires in the U.S. happened in homes without smoke alarms, and 41% of victims were asleep when the fire started. In 2018, China reported 11,523 deaths from carbon monoxide poisoning; of these, 72.59% occurred at home in December, 67.42% in January, and 66.48% in February.
Evidence grade: B
Sources: Marshall SW et al. (1998). Fatal residential fires: who dies and who survives? JAMA. <https://doi.org/10.1001/jama.279.20.1633>; USFA (2022). Fatal Fires in Residential Buildings (2018-2020), Topical Fire Report Series 22(2). <https://www.usfa.fema.gov/downloads/pdf/statistics/v22i2.pdf>; You J et al. (2020). Number of Deaths due to Carbon Monoxide Poisoning by Month and by Place of Death — China, 2018. China CDC Weekly. <https://doi.org/10.46234/ccdcw2020.008>
Notes: This grade is assigned because only one study exists on smoke alarms; it compared past fire incidents in various homes rather than using a randomized trial design. No research has shown that carbon monoxide alarms reduce mortality rates. The reported benefits are inferred from the fact that most poisoning deaths happen at home during winter.
Source links
- Marshall SW 等 (1998). Fatal residential fires: who dies and who survives? JAMA. ↗
- USFA (2022). Fatal Fires in Residential Buildings (2018-2020), Topical Fire Report Series 22(2). ↗
- You J 等 (2020). Number of Deaths due to Carbon Monoxide Poisoning by Month and by Place of Death — China, 2018. China CDC Weekly. ↗
- Pinned original chapter on GitHub ↗
Read the complete Chinese source and notes
3. 装烟雾报警器；冬天在室内烧煤、用燃气取暖的再装一氧化碳报警器
成本: 烟雾报警器一个 30 到 100 元。一氧化碳报警器一个 50 到 150 元。装好以后每年换一次电池。
说人话: 一个能正常工作的烟雾报警器，能把住宅火灾里死亡的概率降约六成。起火时有四成人在睡觉，光靠鼻子是醒不过来的。冬天在屋里烧煤或用燃气的，再加一个一氧化碳报警器。中国 2018 年有 1.15 万人死于一氧化碳中毒，冬天那三个月七成死在家里。
收益: 美国北卡罗来纳州研究了一批住宅火灾，回头比对出事和没出事的家庭。家里有一个能正常工作的烟雾报警器，死亡风险下降约六成。原值 OR 0.39，可信范围 95% CI 0.18 到 0.83。美国 2018 到 2020 年，有人住的住宅里发生的致死火灾，24% 家里没有烟雾报警器，41% 起火时人在睡觉。中国 2018 年报告一氧化碳中毒死亡 11,523 例。这些死亡里，12 月有 72.59%、1 月有 67.42%、2 月有 66.48% 发生在家中
证据等级: B
来源: Marshall SW 等 (1998). Fatal residential fires: who dies and who survives? JAMA. <https://doi.org/10.1001/jama.279.20.1633> ; USFA (2022). Fatal Fires in Residential Buildings (2018-2020), Topical Fire Report Series 22(2). <https://www.usfa.fema.gov/downloads/pdf/statistics/v22i2.pdf> ; You J 等 (2020). Number of Deaths due to Carbon Monoxide Poisoning by Month and by Place of Death — China, 2018. China CDC Weekly. <https://doi.org/10.46234/ccdcw2020.008>
备注: 给 B 的原因：烟雾报警器这边只有一项研究，做法是回头比对出事和没出事的家庭，不是随机分组的试验。一氧化碳报警器本身没有降低死亡率的研究。这里的收益是按「中毒死亡集中在冬季、集中在家中」推出来的。
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