Appendix A –  Data Field Description Proforma,,,,,,,,,,,,
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Data Field Position,Column A,Column B,Column C,Column D,Column E,Column F,Column G,Column H,Column I,Column J,Column K,Column L
Data Field Name,PDU code,PDU name,Total no. of patients submitted,Total no. of patients used for HbA1c outcome analysis,Total no. of patients ex- cluded from HbA1c out- come analy- sis*,% of patients excluded from HbA1c outcome analysis*,"% with HbA1c<58
mmol/mol (7.5%)",Mean HbA1c (mmol/ mol),Mean HbA1c (%),Median HbA1c (mmol/ mol),Me- dian HbA1c (%),% of incomplete records of  care processes except HbA1c
Data Field Description,Paediatric diabetes unit code (These are participating sites within England),Paediatric diabetes unit Name (These are participating sites within England),Total no. of patients with diabetes submitted by Paediatric diabetes unit ,"Total no. of patients used for HbA1c outcome analysis. Patients must have a valid NHS number, date of birth, date of diagnosis and gender submitted to be included in analyses of care processes and outcomes. Furthermore, they must be assigned a PDU PZ code.
",Percentage of patients with Glycated Haemoglobin A1c (HbA1c) less than 7.5%,"Percentage (%) of patients used for HbA1c outcome analysis. Patients must have a valid NHS number, date of birth, date of diagnosis and gender submitted to be included in analyses of care processes and outcomes. Furthermore, they must be assigned a PDU PZ code.",Percentage (%) of patients with Glycated Haemoglobin A1c (HbA1c) less than<58mmol/mol (7.5%),Mean value HbA1c (mmol/ mol),Mean value for patients HbA1c as a %,Median value HbA1c (mmol/ mol),Median value for patients HbA1c ,"Percentage of incomplete records who are missing all key care processes (except HbA1c). These care processes include measurement of cholesterol, blood pressure,
blood creatinine, urinary albumin, body mass index, eye screening and foot examination."
Data Field Type,Alphabet and numbers,text,Numbers,Numbers,Percentage ,Percentage ,Percentage ,mmol/mol,Percentage ,mmol/mol,Percentage ,Percentage 
Data Field Format,5 Alpha Numeric,text,Numbers,Numbers,0.00%,0.00%,0.00%,number,0.00%,number,0.00%,0.00%
"How Null Data Are Handled ie Null = """"",Not Applicable,Not Applicable,Not Applicable,Not Applicable,"Null = ""Missing /or Invalid""","Null = ""Missing /or Invalid""","Null = ""Missing /or Invalid""","Null = ""Missing /or Invalid""","Null = ""Missing /or Invalid""","Null = ""Missing /or Invalid""","Null = ""Missing /or Invalid""",Not Applicable