Just as for the DX Reality Check, and for similar reasons, the best way to consider realistic human scores for HT is to use the same results as those from the ST Reality Check . This is because ST and HT are similar stats, with similar uses and the same price.

You may also want to consider one's susceptability to disease. How many days per year one is incapacitated (in bed) due to sickness. This will be variable in the real world based upon how many people the individual comes in contact with on a regular basis. Children frequently are exposed to illnesses at schools so they are not a good model (they also tend to "fake" illness to avoid responsibility). Adults that are no longer attending college (where illness rates are still high) may wish to consider the number of days they have taken off from work due to illness over the course of their lifetime, divided by the number of days they "should" have worked over the course of their lifetime (usually around 225 days per year). Here is an untested method, based on an average of 7 sick days per year:

HT 7: >0.30 (~seventy absences per year)

HT 8: <0.14 (~thirty absences per year)

HT 9: <0.07 (~fifteen absences per year)

HT 10: <0.03 (~seven absences per year)

HT 11: <0.015 (~three absences per year)

HT 12: <0.005 (~one absence per year)

HT 13: <0.001 (~one absence per 5 years)

The most important variable concerning illness is will. People are said to have died due to a lack of will, and certainly will is a factor in whether people take off from work (or at least how much they appreciate their job, and how much pressure they are under to continue working despite illness or injury).

Given this discussion an interesting couple of Advantages and Disadvantages follow:

Plagued Childhood (Advantage): The character grew up in a very crowded environment and did not have the advantages of modern medical technologies (esp. vaccines). As a child the character experienced a miriade of diseases granting him an immunity to most and improving his immune system in general. Characters with a Plagued Childhood have a +3 to fighting off diseases (but not poisons or artificial diseases such as anthrax). Gamemasters may wish to force characters with this advantage to have scarring marks from diseases that detract from their attractiveness. Examples could include facial scars from chicken pox, facial flaking and/or partial or total blindness from smallpox or body scars from bubonic plague.

Sterile Childhood (Disadvantage): The character grew up in an extremely sterile environment. Perhaps their parents kept the household clean with an array of antibiotics, or the character merely grew up in a sterile future where diseases are rare (as most have been cured) or in the past where small, isolated populations do not have the opportunities to gain immunities to otherwise common diseases and generally weakening the character's immune system. Since illnesses are generally stronger and more deadly to adults, sterility as a child can pose a serious problem. Characters with a Sterile Childhood have a -3 to fighting off diseases (but not poisons or artificial diseases such as anthrax).