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ID Schema

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Schema for Multicentre Trials

Use a study ID consisting of 3 components in the format XXXXXX.XXXX:

  • 2 digit study number
  • 4 digit site code
  • 4 digit randomisation number

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Study IDs are IDs are stored as character variables but a values to ensure that zero place holders are not dropped. The randomisation number is assigned sequentially at each site after randomisation. A decimal point is included placed between the site code and randomisation to allow the ID to be more easily converted to a numberical variable and manuipulated. The randomisation number is assigned after randomisation and is sequential at each site, allowing sites to monitor their recruitment. The study number is essential to ensure that records and sample between studies remain separatenumber. This allows sites to monitor their recruitment and ensures the ID can be easily converted to a numerical value if manipulations are required. The study number ensures that samples can be identified across studies.

The following site codes have been used in previous Australasian multicentre trials and are recommended have been retained for continuity:

 

Auckland City Hospital

9180

Middlemore Hospital

9584

Waikato Hospital

9382

Wellington Hospital

9687

Christchurch Hospital

9283

Dunedin Hospital

9485

Hawke’s Bay Hospital

9510

Whakatane Hospital

9675

North Shore Hospital

9820

Waitakere Hospital

9988

Tauranga Hospital (Bay of Plenty)

9320

Randomisation in multiple pregnancy

To deal with unit of analysis issues, there are two common solutions:

  1. Add a suffix where 0 is mother; infants are coded 1, 2 and 3 according to birth order in multiple pregnancy or 5 for singleton. A surviving twin would be coded as 1.
  2. Assign a separate "randomisation number" to the infant(s) at birthfetuses, e.g., start at 5000 ormothers at 1000 and babies at 5000.

Study Codes

 

10

PROVIDE 

11 

 HINT2

12

 hPOD

13 

 EYE-SPY

14

 

15 

 

16

 

17

 GEMS

18

 TARGET

19

 

20