Items | Brief Descriptions | Reporting [n (%)] | Not Applicable | ||
---|---|---|---|---|---|
Yes | Partly Yes | No | |||
Title and abstract | |||||
R1.1a | Type of data | 182(97.3) | Â | 5(2.7) | Â |
R1.1b | Name of databases | 134(71.7) | 2(1.1) | 51(27.2) | Â |
R1.2a | Geographic region | 117(62.6) | Â | 70(37.4) | Â |
R1.2b | Time frame | 97(51.9) | Â | 90(48.1) | Â |
R1.3 | Linkage between databases | 33(50) | Â | 33(50) | 121 |
Methods | |||||
R6.1 | Population selection methods | 75(40.1) | 112(59.9) | Â | Â |
R6.2 | Validation of codes/algorithms for population selection | 21(28) | Â | 54(72) | 112 |
R6.3 | Graphical display of data linkage process | 12(18.2) | Â | 54(81.8) | 121 |
R7.1a | Codes/algorithms of exposures | 28(15) | 2(1) | 157(84) | Â |
R7.1b | Codes/algorithms of outcomes | 43(23) | 34(18.2) | 11(5.9) | Â |
R7.1c | Codes/algorithms of confounders and effect modifiers | 23(12.3) | 7(3.7) | 157(84) | Â |
R12.1 | The extent of database accessed | 153(81.8) | Â | 34(18.2) | Â |
R12.2 | Data-cleaning methods | 65(34.8) | Â | 122(65.2) | Â |
R12.3 | Detail of data linkage | 28(42.4) | 28(42.4) | 10(15.2) | 121 |
Results | |||||
R13.1 | Detail of population selection | 107(57.2) | 19(10.2) | 61(32.6) | Â |
Discussion | |||||
R19.1a | Inherent limitations | 155(82.9) | Â | 32(17.1) | Â |
R19.1b | Risk of misclassification | 58(31) | Â | 129(69) | Â |
R19.1c | Limitations of codes/algorithms and the validation | 19(25.3) | Â | 56(74.7) | 112 |
R19.1d | Implications of the missing variables and missing data | 118(63.1) | Â | 69(36.9) | Â |
R19.1e | Eligibility of results over time | 34(18.2) | Â | 153(81.8) | Â |
Other information | |||||
R22.1a | Study protocol availability | 44(23.5) | Â | 143(76.5) | Â |
R22.1b | Raw data availability | 38(20.3) | Â | 149(79.7) | Â |
R22.1c | Supplementary materials availability | 100(53.5) | Â | 87(46.5) | Â |