“…Menstruation also often made participants feel disgusting or unclean [28, 33, 38, 47, 54-56, 58, 60, 64, 68, 73, 74, 81, 86, 87, 92-94, 96-99, 110, 111, 117, 119, 121, 135, 136, 143]. Negative emotional responses, particularly shame and worry, often led to increased mental burden [25, 34, 38, 46, 47, 51, 53, 55, 64, 77, 81, 88, 109, 112, 117-120, 122, 128, 132, 138, 143] and sometimes non-participation where the negative emotional responses were linked to concerns about respondents' own ability to conceal their menstrual status [48,49,55,71,93,94,119,127,135,141].…”