You don't have to be bedridden to have lungs that are one cold away from death.
People with advanced COPD etc are everywhere but can walk short distances etc and prefer cruises to schlepping through airports and whatnot.
Knowing people who go on large long cruises they tell me they've never been on one where they didn't have at least one death. Indeed I know people with serious health issues who go on these knowing there is good on site medical care at hand.
Large ships have a lot of passengers. In the US Men hit a 2% chance of death at 68, which jumps to 3.6% at 75. At 85 that jumps to 9.6%, and by 95 your at 26% and the numbers keep increasing.
This means you can’t simply look at the average age to estimate risk factors. Still a 2% risk of death per year x 3000 people = 1.15 deaths per week ignoring crew. In other words what you’re describing is still a fairly heathy population.
I am pointing out curse ship populations are actually at lower risk than society for this specific disease. The crew is all young and it’s mostly irrelevant if someone is 4 or 40 relative to people being a heathy 80 or sick 90.
That's just not true. It's pretty much impossible to be 80 years old and not be more susceptible to infection generally. Statistically the people dying have an average of 2.7 comorbiditities.
Average is meaningless in this context. US Men hit a 2% chance of death at 68, which jumps to 3.6% at 75. At 85 that jumps to 9.6%, and by 95 your at 26% and the numbers keep increasing. A 50:50 mix of 85 year old men and 38 year old men have vastly higher risk of death than a group of just 62 year olds.
Except those higher odds of death are strongly associated with major heath issues. So, simply excluding the sickest 5% of the population makes a huge difference in survival rates.
based on what?