Right, but even if we we're to accept those results at face value*; they don't necessary contradict what I said. The study is "among crash involved cyclists". There's evidence that motorists drive closer to cyclists wearing helmets, so it wouldn't be a stretch to imagine that wearing a helmet increases the risk of being involved in a crash in the first place.

If you're looking for the risk of KSI with or without helmets; then that's the thing you need look at amongst all cyclists... not restricting it to the population of "crash involved cyclists".

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* which I don't necessarily - for some papers at least you can show that using the methodology in the paper it follows that wearing a helmet reduces the risk of leg injuries...

Apart from injury mitigation considerations; when you're skiing getting cold is often a concern; whereas for cycling you're normally too hot.

Skiing typically involves higher speeds than cycling, so ski helmets tend to be stronger. Cycle helmets are not designed for high speed impacts, rather to mitigate the kind of thing that you might expect when fall off your bike - i.e. the speed your head picks up as you drop vertically off a bike.

Incidentally - as far as I know there's no good quality evidence that the wearing of cycle helmets actually makes any statistical difference to the likelihood of death or serious injury.

Which Ladas are like Oprah?

Suppose you have a huge metal water tank filled with water. You can probably get pretty close to 100% water by volume. But the tank is solid, and will feel very much like a solid if you hit it.

From the outside you can't immediately tell that the tank is mostly water.

The most significant thing is that Estonia and Lithuania are members of NATO and Finland (probably) will be soon.