Take "Worrying about your health", I think "worrying" here means "being anxious". So while normal health-conscious person cares about her/his health(eats well, sleeps well, takes necessary prescribed medications, etc), she/he isn't anxious about it. In contrast, depressed person may worry about her or his health without taking any actual steps to improve the situation.
Or take "Criticizing yourself or blaming yourself"(note second yourself, this question in kindle book is different, maybe I need to prepare correct pdf). If you spend your whole week under pressure of self-criticism, thinking about every mistake you made and every imperfection your work have, however small or large, then this is definitely 4. "Somewhat perfectionistic" is 1 in my book. 4 is "Extremely perfectionistic".
Or "Loss of interest in sex"? Why would an exteme loss of sex drive happen to a normal person?