Table 2 Synergistic interaction effects between SNS use frequency and PES on poor mental health among females

Less than almost every hour & high PES

506 (60.4)

216 (42.7)

1 (ref)

Almost every hour & high PES

115 (13.7)

67 (58.3)

1.70 (1.12–2.59)*

Less than almost every hour & low PES

162 (19.3)

98 (60.5)

2.00 (1.39–2.87)*

Almost every hour & low PES

55 (6.6)

39 (70.9)

3.12 (1.69–5.76)*

Total

838 (100)^a

420 (50.1)

SI = 1.25