Interesting new article about data on unintentional deaths and injuries from CO

See for an examination of the Gas Safety Trust’s statistics versus CO-Gas Safety’s data.

Staight Statistics

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Carbon Monoxide: the killer with no official record

Tags: ONS, HSE, energy, deaths, accidents

Several papers yesterday headlined claims that accidental deaths from carbon monoxide poisoning rose sharply in the 12 months to the end of June 2011.

“CO poisoning deaths treble in a year” is The Press and Journal’s take on the story.  The Belfast Morning Telegraph reports that Ulster tops the UK deaths table, while the BBC says that Devon has been named as the top “hot spot” for incidents of CO poisoning.

The reports derived from the Gas Safety Trust’s Carbon Monoxide Hotspot Report for 2011, which records 25 fatalities in 2010-11 against just seven the year before. It further finds that while deaths have risen the number of incidents has fallen from 72 to 50, and the number of casualties from 138 to 80.

Ulster comes high on the list because of three incidents in which a total of seven people died. In Devon, there were five incidents and two deaths.  These numbers are simply too small and randomly distributed to allow a league table of hot spots to be constructed. But are they even right?

The figures are based entirely on press reports. Such sources aren’t to be despised, but it says something for the dearth of reliable information about carbon monoxide deaths that they should be the sole source. While deaths that are reported are likely to be accurate as they generally originate from coroners’ inquests, there may be others that are not reported at all.

Other sources of data are the Health and Safety Executive and the charity CO-Gas Safety, and both tell a very different story. The HSE data cover only those incidents caused by flammable gas, mainly piped gas but also LPG. They record 16 deaths in 2005-06, 10 in 2006-07, 13 in 2007-08, 15 in 2008-09, and (provisionally) nine in 2009-10. Delays in coroners’ inquests mean that this figure is likely to be too low.

CO-Gas Safety’s figures are far more convincing, although it is a small charity operating on a modest budget.  It records (with names and dates) 594 people who have died in the past 15 years (an average of around 40 a year) and its data includes deaths involving gas mains, portable gas, solid fuel and petrol. It too uses press reports but it also contacts coroners to check details. The best summary of its work appears in this press pack.

The charity’s most recent data (see Table) show reductions in deaths since the 1990s but a pretty steady figure for the past decade of around 30 deaths a year. In a 2009 report for the Department of Communities and Local Government, the CO-Gas Safety figures are quoted and compared with a very similar estimate for 2007 made by the Office for National Statistics of 35 deaths due to CO that year. This estimate appears to have been made at the DCLG’s request and is not part of the normal ONS output.


However, these figures are in sharp disagreement with the data from the Hot Spot report. There’s no reason to believe that deaths in 2009/10 were as low as seven, as the Hot Spot report claims – CO-Gas Safety counted 25. So the purported increase to 25 this year found by the Hot Spot report is probably not an increase at all. Nor is it the case, if one considers all the deaths recorded by CO-Gas Safety over the past 15 years, that either Devon or Northern Ireland stand out as in any way exceptional. Both fall into the second-highest quintile for CO-related accidental deaths over that period.

What does stand out is the absence of official statistics on this cause of death. My guess is that the CO-Gas Safety figures are about as good as there are. It’s extraordinary that the founder and director of the charity, Stephanie Trotter OBE, assisted by a friend, should be able to collect figures that appear beyond the heating industry. The figures are regularly updated, mostly by adding deaths for recent years because it can take three years for an inquest to be held, but very occasionally removing deaths that turn out later to have been suicides.

As she puts it on her website: “We are shocked that our data is better than Government’s. We try to check most deaths with Coroners and we have built up a good relationship with them over the 15 years we have been doing this. We also check with other bodies, such as the Solid Fuel Association, which has always been extremely helpful to us.”

It’s also rather shocking that nobody is trying harder to fill this gap. ONS has demonstrated that it has the capacity to make an estimate, but doesn’t do so on a regular basis.  The evidence is that the number of deaths has fallen since the 1990s, but it is still unacceptably high. There are also many “mear-misses” and in September the Department of Health issued experimental data derived from Hospital Episode Statistics suggesting that 4,000 people a year attend A&E departments with CO poisoning. The DH also believes that there are 50 deaths a year, and 200 injuries tnat require admission to hospital. This suggests that the deaths recorded by CO-Gas Safety may be an underestimate.

The Hot Spots report was researched and compiled by an undergraduate at St John’s College, Cambridge. No offence to him, and I’m sure he did the best with the data at his disposal, but I think it’s time greater efforst were made to measure this significant cause of death. The Gas Safety Trust records that it has spent more than £170,000 on data collection and analysis since September 2007, employing a number of consultancies to do the work. The Hot Spots report is not the only publication it produces using this data, but it is the one most likely to be read by gas consumers.

CO-Gas Safety, meanwhile, is seeking grants to continue its work.

Mark Piney (not verified) wrote,

Fri, 14/10/2011 – 08:32

I am not sure that the HSE stats are set out to show this, but there’s a seasonal pattern to CO deaths (as I recall). Most occur in Autumn/Winter months. Apart from this observation, I congratulate you on another excellent analysis. And it is a scandal that there’s no standardised, routine effort made to collect accurate statistics and work done nationally to get the numbers down. I hope you’re efforts stimulate debate, and action.

christopher crossman (not verified) wrote,

Fri, 14/10/2011 – 10:33

we have had two hard winters so is it not obvious that CO-related deaths will rise in line with increased use of supplementary indoor heating?


Rob Aiers (not verified) wrote,

Mon, 17/10/2011 – 17:55

I have been trying to get the authorities various to correlate the figures and come up with a much better reporting structure for years. The figures are so far out of whack and no one is really taking on board the very real need to understand what the figures are. The coroner does not routinely check bodies for poison and in any event it reports to the home office. Doctors are no where near as familiar as they should be with chronic and acute poisoning and what to look for by way of symptoms. I have offered a correlation/marketing platform facility to various departments for a number of years to no avail. We are the worlds number resource for carbon monoxide related issues with 6 thousand visitors a week we are able to draw people together in the CO. community. It seems to me that in the 12 years that we have been running the web site that all official departments have spent fortunes covering their backsides rather than getting on with the job of protecting the public. Stephanie however has done a Stirling job over the years as have Co-Awareness at getting the message out. It really is about time that the Government stepped up to the plate. With better understanding we would know better how many people have died or been injured, we would also know the potential cost to the NHS of the of doing nothing!

Anonymous (not verified) wrote,

Wed, 19/10/2011 – 01:28

Carbon monoxide and carbon dioxide (car exhaust gases) used to account for a goodly number of suicide attempts and deaths. However, with changes to car exhaust systems they have disappeared as a method of suicide. Are there any lessons to be learnt, I wonder ?

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