Right, so assuming everyone's got dry hands, or comparably dry hands, then you'd expect to see lower fatality rates in the USA (and other countries that use ~110V) compared to countries that use 230-240V.

Does that hypothesis actually align with the data?

I'm struggling to find good figures that spell this out on a region by region basis.

The data are often muddied, f.e. by including lightning strikes, ladders or trucks hitting overhead high-voltage power lines, self-harm / suicide attempts, etc.

For example, some Australian data for a 2-year period [1]

  > 55 deaths involving electrical injury - 50 male, 5 female
  > 8 were lightning strikes
  > 17 were intentional self-harm
  > 18 were were due to exposure to other specified electric current

Either way that's about 26 / year out of a population of ~25M ~= 1 per million.

In the USA I'm finding:

  > Electrocution is the fifth leading cause of occupational injury death
  > 41% of cases involved overhead power lines

Alternatively [3] for USA:

  > Electrocution is sixth among causes of workplace deaths
  > Electrical hazards cause more than 300 deaths

300 out of a population of ~330M ~= 1 per million

[1] https://www.aihw.gov.au/reports/injury/electrical-injuries-d...

[2] https://injuryprevention.bmj.com/content/8/4/306

[3] https://www.electrocuted.com/safety/statistics/