16. The scale based on unavailability applies where an independent adult or an adult member of a family(1) proves, by producing a medical report, that his physical or mental condition prevents him from availing himself, for a period of at least one month, of a measure thay may be proposed to him under section 23;
(2) applies therefor by reason of pregnancy, from the twentieth week, as attested by a medical certificate, until the fifth week after delivery; the medical certificate may be replaced by a written report attesting the pregnancy, signed by a midwife and indicating the name and date of birth of the adult, the number of weeks of pregnancy and the expected or actual date of delivery;
(3) has the care of a dependent child in the cases and subject to the conditions determined by regulation, or of a dependent child who does not attend school by reason of a physical or mental handicap;
(4) is 55 years of age or over and applies therefor;
(5) shares a dwelling unit with a person whose autonomy is significantly reduced by reason of a physical or mental condition requiring constant care by the adult.