时间(月) | Native(n=115) | Non-Native(n=30) | P value |
<=12 | 1(0.9%) | 1(3.3%) | 0.729a |
13-24 | 12(10.4%) | 2(6.7%) | |
25-36 | 21(18.3%) | 3(10.0%) | |
37-48 | 20(17.4%) | 7(23.3%) | |
49-60 | 23(20.0%) | 9(30.0%) | |
61-72 | 14(12.2%) | 1(3.3%) | |
73-84 | 9(7.8%) | 2(6.7%) | |
85-96 | 9(7.8%) | 3(10.0%) | |
>96 | 6(5.2%) | 2(6.7%) |


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