“…Premature rupture of membrane (PROM) was another frequently reported risk factor of PTB reported in 15 of the included studies [ 9 , 18 , 19 , 20 , 23 , 27 , 29 , 37 , 50 , 74 , 76 , 77 , 86 , 91 , 103 ]. In addition, other adverse birth outcomes in previous deliveries such as previous abortions [ 49 , 63 , 77 , 81 , 104 ], caesarean delivery [ 26 , 86 ], stillbirths [ 19 , 49 ], miscarriages [ 26 , 94 ], low birth weight [ 26 , 68 ], complicated pregnancy/delivery [ 36 , 57 , 58 , 71 , 74 , 76 , 90 ], and perinatal death [ 68 ] were reported to be associated with increased odds of PTB. Five of the included studies [ 36 , 57 , 58 , 71 , 74 , 76 , 90 ] also reported antepartum haemorrhage as a risk factor for PTB.…”