Table 1.

Number of participants by gender and mean age for each one of the groups

	Total	Female	Male	Mean Age (SD)
Recruited	84	35	49	21.75 (1.48)
Full control	42	17	25	21.67 (1.43)
Full gratitude	42	18	24	21.83 (1.54)
Failed to complete (control)	3	1	2	21.33 (1.15)
Failed to complete (gratitude)	1	1	0	22.00 (1.41)
Control	18	7	11	21.86 (1.53)
Gratitude	22	10	12	22.86 (1.33)
30-day follow-up respondents (full gratitude/full control)	70	32	38	21.64 (1.37)
90-day follow-up respondents (full gratitude/full control)	70	32	38	21.67 (1.38)
Control participants who responded to both follow-up’s	18	7	11	21.56 (1.34)
Gratitude participants who responded to both follow-up’s	20	10	10	22.00 (1.49)

SD standard deviation