For more information and examples, see APA6, Section 4.13.
Minus sign: A typeset minus sign is the same length as an en dash, but it is slightly thicker and slightly higher. If a minus sign is not available in your Word-processing program, use a hyphen with space on both sides (e.g., a – b). For a negative value, use a minus sign with a space before but no space after (e.g., -5.25).
Hyphen: Use no space before or after (e.g., trial-by-trial).
Em dash: An em dash is longer than a hyphen or en dash and uses to set off an element added to amplify or to digress from the main clause (e.g., Studies—published and unpublished—might include). Use no space before or after an em dash. If an em dash is not available on your keyboard, use two hyphens with no space before or after. The shortcut is to press Ctrl + – + – (2 hyphens) = ––.
En dash: An en dash is longer and thinner than a hyphen but shorter than an em dash, and will use in between words of equal weight in a compound adjective (e.g., Chicago–London flight). This hyphen might also used in between number ranges, such as page numbers in citations and references. Type as an en dash (–) by pressing Ctrl + – , a single hyphen. Use no space before or after.