Table 5 Sensitivity and heterogeneity test of the included cohort studies pooled by HR

McDermid et al. (2013)^a [32]

2.08 (1.76–2.46)

92.4

Li et al. (2013)^a[33]

2.05 (1.72–2.43)

93.4

Beshir et al. (2019)^a [10]

1.99 (1.68–2.35)

93.7

Ayalaw et al. (2015)^a[30]

2.00 (1.69–2.37)

93.7

Batista et al. (2013)^a[31]

1.97 (1.66–2.33)

93.6

Chu et al. (2019) ^a [17]

2.01 (1.69–2.41)

93.5

Alemu et al. (2016)^a [22]

1.98 (1.67–2.35)

93.7

Enju et al. (2015)^b [21]

2.07 (1.75–2.46)

91.9

Kerkhoff et al. (2015)^b [20]

2.08 (1.76–2.46)

93.6

Phyo et al. (2019)^b [23]

2.00 (1.68–2.38)

93.7

Chang et al. (2015)^c [34]

1.98 (1.67–2.35)

93.4

Choun et al. (2013) ^c [35]

2.00 (1.69–2.37)

93.7

Enju et al. (2015) ^d [21]

2.05 (1.69–2.50)

93.7

Kerkhoff et al. (2015) ^d [20]

2.06 (1.74–2.45)

93.6

Phyo et al. (2019) ^d [23]

1.89 (1.62–2.21)

91.8

Choun et al. (2013) ^e [35]

1.96 (1.66–2.32)

93.5

Enju et al. (2015) ^e [21]

2.01 (1.68–2.41)

93.1

Chang et al. (2015) ^e [34]

1.96 (1.66–2.32)

93.6

Kerkhoff et al. (2015) ^e [20]

2.07 (1.74–2.45)

93.6

Phyo et al. (2019) ^e [23]

1.91 (1.62–2.25)

93.0

Combined

2.01 (1.70–2.37)

93.4