Urine result | Peezy UCD | Whiz Midstream UCD | Standardised verbal instructions |
---|---|---|---|
Intention-to-treat analysis, N a | 395 | 398 | 405 |
Mixed growth, n (%)b | 101 (26.5) | 110 (28.2) | 117 (29.0) |
Not ‘mixed growth’, n (%) | 280 (73.5) | 280 (71.8) | 286 (71.0) |
Device failures, n | 100 | 35 | 0 |
Missing, n | 14 | 8 | 2 |
Adjusted RR of contamination | 0.91 | 0.98 | Ref |
95% CI | 0.76 to 1.09 | 0.97 to 1.20 | — |
P-value | 0.315 | 0.820 | — |
Per-protocol, N c | 295 | 363 | 405 |
Mixed growth, n (%)b | 77 (26.3) | 104 (29.1) | 117 (29.0) |
Not ‘mixed growth’, n (%) | 216 (73.7) | 254 (70.9) | 286 (71.0) |
Missing, n | 2 | 5 | 2 |
Adjusted RR of contamination | 0.91 | 1.01 | Ref |
95% CI | 0.73 to 1.14 | 0.82 to 1.24 | — |
P-value | 0.405 | 0.955 | — |
Log-Poisson generalised linear mixed effect model of lab culture urine result modelled against intervention arm as fixed effects, and GP practice as a random effect. Level of significance = 0.025.
↵a All participants with a urine culture result available regardless of whether the allocated collection method was used.
↵b Mixed growth = contamination.
↵c All participants with a urine culture result available from the allocated collection method instructions. RR = relative risk. UCD = urine collection device