| Pre-intervention (Oct 2016–Mar 2017) | Post-intervention (Oct 2017–Mar 2018) | P value |
Total | 41 254 (100) | 26 336 (100) | <0.001 |
Number of vitamin D requests |
Requests with vitamin D <30 nmol/l | 15 358 (39.4) | 8810 (34.5) | <0.001 |
Requests with vitamin D 30–50 nmol/l | 11 166 (28.6) | 8044 (31.5) | <0.001 |
Requests with vitamin D >50 nmol/l | 12 469 (32.0) | 8671 (34.0) | <0.001 |
Demographic characteristics |
Age, years | 47.9 (20.5) | 46.5 (20.4) | <0.001 |
Male | 13 914 (33.7) | 8512 (32.3) | <0.001 |
Ethnicgroup | | | <0.001 |
Caucasian | 20 103 (55.9) | 11 991 (54.8) | |
Asian | 12 766 (35.5) | 8327 (37.3) | |
Black | 1235 (3.4) | 845 (3.8) | |
Other | 1890 (5.3) | 1194 (5.3) | |
Biochemistry values |
Vitamin D nmol/la | 36 (24–57) | 38 (26–58) | <0.001 |
Calcium mmol/l | 2.26 (0.09) | 2.25 (0.09) | <0.001 |
Phosphate mmol/la | 1.11 (1.10, 1.11) | 1.12 (0.99, 1.25) | <0.001 |