Hospital factors Incidence, per 100,000 live births (95%CI) RR P value
Hospital type
Type of hospital
Tertiary hospitals 14.4(14.3, 14.5) Ref <0.001
Secondary hospitals 5.7(5.5, 5.9) 0.4
Primary hospitals 0.0(0.0, 0.0) 0.0
Characteristics of hospital
General hospitals 26.5(26.3, 26.7) Ref <0.001
Specialized hospitals 5.6(5.6, 5.6) 0.2
Cesarean rate
0-30% 26.3(25.9, 26.7) Ref <0.001
30%-50% 9.6(9.6, 9.7) 0.4
>50% 23.4(23.1, 23.6) 0.9
System and strategy
VTE management system
Yes 14.5(14.4, 14.6) Ref <0.001
No 6.0(5.8, 6.1) 0.4
VTE risk assessment scale
Yes 15.5(15.4, 15.6) Ref <0.001
No 6.2(6.1, 6.2) 0.4
Emergency transfer/consultation
Yes 13.7(13.6, 13.8) Ref <0.001
No 0.0(0.0, 0.0) 0.0
Diagnosis and treatment
D-dimer
Yes 13.5(13.5, 13.6) Ref <0.001
No 0.0(0.0, 0.0) 0.0
B ultrasound of lower extremity vein
Yes 13.0(12.9, 13.1) Ref <0.001
No 18.7(18.4, 19.1) 1.4
CTPA
Yes 13.8(13.7, 13.9) Ref <0.001
No 11.1(11.0, 11.2) 0.8
Anticoagulants
Yes 13.1(13.0, 13.2) Ref <0.001
No 15.2(15.0, 15.4) 1.2
Elastic stockings/compression device
Yes 14.6(14.5, 14.7) Ref <0.000
No 6.2(6.0, 6.4) 0.4
Patient education
Health education
Yes 17.2(17.0, 17.3) Ref <0.001
No 2.0(2.0, 2.1) 0.1
Early mobilization
Yes 13.8(13.7, 13.9) Ref <0.001
No 0.0(0.0, 0.0) 0.0
Mobilization after vaginal delivery
The same day 13.2(13.1, 13.3) Ref <0.001
One day after or later 16.6(16.2, 17.0) 1.3
Mobilization after Cesarean section
The same day or one day after 14.6(14.2, 15.0) Ref <0.001
Two days or later 16.6(16.2, 17.0) 1.1
Total 13.4(13.3, 13.4)