randomized controlled trial of ionization and photoelectric smoke alarm functionality

by:CTECHi     2020-05-04
[Purpose] there are no reasons for comparing functions
Function, as well as the nuisance alarm level of two common types of smoke alarms after low installationto mid-
Income-level families in Kim County, Washington.
Methods: A randomized controlled trial was conducted in 761 households.
Ionization or photoelectric smoke alarms were installed from June 1-20, 2000 to July 31.
The main outcome measures are: Percentage of effective research alerts, observed non-
Functional status and self
Reported frequency of nuisance alarms for 9 months and 15 months-up.
Results: 9 months after installation, the ionization rate was 20%, and the photoelectric alarm rate was 5%.
Functional, difference that lasts for 15 months, the most common cause of both types is that the battery is disconnected or missing.
Relative to the photoelectric alarm, the risk ratio of ionization is right and wrong
Function or removal is 2. 7 (95% CI 1. 8 to 4. 1)
In the next 15 monthsup.
These findings did not change because of the educational level or the presence of smokers, children under 5 years of age or adults under 65 years of age.
Conclusion: the efforts to prevent burns are aimed at increasing the ownership of smoke alarms and improving the maintenance of functional status.
The results suggest that fire prevention programs or the selective use of photoelectric alarms by consumers may provide a longer period of time
Long-term protection of similar groups of people.
Smoke alarms designed to minimize nuisance alarms may also result in longer-term functionality.
Smoke alarm is an effective intervention for damage caused by residential fires.
A recent survey shows that 95-97% of households in the United States have at least one smoke alarm, of which 34 have a lower prevalence in rural areas.
However, alerts that are disconnected from the battery, contain dead batteries or removed do not provide protection due to nuisance alarms.
Non-operational levels range from 20% to 36%.
8 The most common types of alarms for home use are ionization, photoelectric, and combined units.
Photoelectric and ionization alarms operate through different mechanisms to detect visible and invisible/fine of combustion by-products, respectively.
9 photoelectric alarms use optical sensors, which are more likely to make sound due to slow smoldering conditions.
By detecting charged particles generated by rapid combustion, the ionization unit is more responsive to the flame.
A nuisance alarm that is frequently triggered during cooking is often cited as the reason for the occupant to disconnect the alarm.
81011 a study conducted in the village of Alaska reported that ionization alarms are more likely to cause nuisance than photoelectric alarms.
However, in a poor neighborhood in London, a random trial of a smoke alarm distribution program reported that photoelectric alarms were more likely to send nuisance alarms.
12 We conducted a randomized controlled trial to compare their functions by installing ionization and photoelectric smoke alarms in the middleto low-
Income families in Kim County, Washington, and compare their functional status, reasons for non-income families
Track the function and frequency of nuisance alarms at 9 months and 15 months-up.
2000 proprietary database of all private property in Jinxian county (MetroScan)
Identified owner
Occupied houses within a four-digit lower valuation (
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