. 2020 Jun 16;20:948. doi: 10.1186/s12889-020-09087-5

Table 3.

Practice of using face mask between adults in different gender and age groups

Practice of using face mask	Gender			Age group
	Male	Female	U	18–24	25–34	35–44	45–54	55–64	65–74	> 75	χ²
	Mean rank		U	Mean rank							χ²
1. When taking care of family members with fever. (n = 1362) ^a	646.86	711.66	208,817.00**	702.03	703.46	705.76	661.54	619.15	679.42	718.11	9.52
2. When taking care of family members with respiratory infection. (n = 1370) ^a	652.74	713.80	212,563.00**	767.86	703.92	698.49	660.94	649.02	660.26	666.93	11.12
3. When visiting clinics during peak season or a flu pandemic. (n = 1478) ^a	675.81	796.03	227,830.00***	813.13	739.32	735.94	756.27	692.17	654.24	780.63	14.46* ^b
4. When visiting hospitals during peak season or a flu pandemic. (n = 1463) ^a	665.20	791.13	220,667.50***	811.35	738.37	711.45	745.39	700.75	670.04	744.97	11.43
5. When having respiratory symptoms. (n = 1463) ^a	656.12	817.95	214,101.00***	850.11	731.82	776.83	746.45	669.18	690.79	715.88	27.75***^c

*p < 0.05, **p < 0.01, ***p < 0.001

^aParticipants who reported “Not Applicable” were excluded

^bPost hoc analysis using Bonferroni-Dunn test revealed a non-significant result

^cPost hoc analysis using Bonferroni-Dunn test revealed a significant difference in practice between participants in “18–24 years old” and “55–64 years old”