Table 3.
Univariable and multivariable Poisson regression of factors associated with in‐hospital delay to surgery
| Univariable analysis | Multivariable analysis | |||
|---|---|---|---|---|
| Relative risk | P | Relative risk | P | |
| Age category (years) | ||||
| 0–10 | 0·93 (0·63, 1·37) | 0·707 | ||
| 11–20 | 0·73 (0·52, 1·01) | 0·055 | ||
| 21–40 | 1·00 (reference) | |||
| 41–60 | 0·91 (0·71, 1·15) | 0·429 | ||
| > 60 | 1·11 (0·85, 1·46) | 0·447 | ||
| Female sex | 1·38 (1·13, 1·68) | 0·002 | 1·33 (1·08, 1·64) | 0·007 |
| Transferred | 0·85 (0·67, 1·07) | 0·168 | ||
| Transferred from | ||||
| Health centre | 1·00 (reference) | |||
| District hospital | 1·34 (0·99, 1·81) | 0·062 | ||
| Private hospital | 1·11 (0·73, 1·68) | 0·634 | ||
| Tertiary hospital | 1·49 (0·77, 2·91) | 0·238 | ||
| Pre‐hospital delay in presentation | ||||
| < 24 h | 1·00 (reference) | 1·00 (reference) | ||
| 24–48 h | 0·63 (0·41, 0·98) | 0·039 | 0·63 (0·41, 0·96) | 0·031 |
| 49–72 h | 1·01 (0·72, 1·44) | 0·927 | 0·93 (0·67, 1·30) | 0·667 |
| > 3 days | 1·18 (0·91, 1·54) | 0·213 | 1·07 (0·83, 1·38) | 0·600 |
| Shock | 1·14 (0·90, 1·43) | 0·279 | ||
| Initial respiratory rate | ||||
| Normal | 1·00 (reference) | |||
| Tachypnoea | 0·92 (0·72, 1·17) | 0·472 | ||
| Admission diagnosis | ||||
| Acute abdomen/peritonitis | 1·39 (1·05, 1·82) | 0·020 | 1·24 (0·94, 1·63) | 0·134 |
| Acute appendicitis | 1·36 (0·98, 1·88) | 0·062 | 1·37 (0·99, 1·89) | 0·059 |
| Bowel or gastric perforation | 1·36 (0·99, 1·87) | 0·058 | 1·19 (0·86, 1·63) | 0·295 |
| Volvulus | 1·30 (0·96, 1·77) | 0·091 | 1·29 (0·94, 1·76) | 0·108 |
| Hernia, irreducible | 1·00 (reference) | 1·00 (reference) | ||
| Other | 1·72 (0·94, 3·16) | 0·078 | 1·45 (0·82, 2·59) | 0·205 |
| Year of admission | ||||
| 2013 | 1·00 (reference) | |||
| 2014 | 0·95 (0·58, 1·56) | 0·833 | ||
| 2015 | 0·92 (0·55, 1·54) | 0·764 | ||
| 2016 | 1·11 (0·67, 1·85) | 0·692 | ||
| 2017 | 1·54 (0·94, 2·49) | 0·083 | ||
| Weekend presentation | 1·13 (0·91, 1·40) | 0·259 | ||
| Night‐time admission | 1·54 (1·29, 1·85) | < 0·001 | 1·59 (1·32, 1·90) | < 0·001 |
| Admission ward | ||||
| To operating room | 1·00 (reference) | |||
| Surgical ward | 2·27 (0·38, 13·60) | 0·370 | ||
| Children's ward | 1·86 (0·30. 11·60) | 0·506 | ||
| Other ward | 1·20 (0·10, 14·70) | 0·887 | ||
| Intermediate care | 2·14 (0·31, 14·70) | 0·437 | ||
| ICU | 1·33 (0·15, 11·60) | 0·795 | ||
| Preoperative imaging* | ||||
| None | 0·92 (0·75, 1·13) | 0·415 | ||
| X‐ray | 1·00 (0·83, 1·22) | 0·982 | ||
| Ultrasound | 1·22 (0·98, 1·52) | 0·073 | ||
| CT | 0·39 (0·06, 2·38) | 0·305 | ||
| Time to obtain laboratory results | 1·60 (1·31, 1·95) | < 0·001 | 1·58 (1·29, 1·94) | < 0·001 |
Values in parentheses are 95 per cent confidence intervals.
*
Patients may have had more than one type of imaging study.