anything,
We all know that sickness rates are high and this is for many different reasons and sometimes it is for social reasons.
I have worked in a charter airline and I can assure you that sickness rates are very high there too (usually due to the youthful demographic of the staff and their wish to party) and these rates are often used to decide which crew are taken on full time or not at the end of the summer season.
What dose surprise me is how you and your wife know what the sickness rates in BA for both cabin crew and pilots are and those of her own company. You are very well informed.