Table 2

Characteristics of study population and complication rate for each factor studied. ‘Other’ procedures include chest drain insertion, DC cardioversion and other upper and lower limb manipulations

Factor	No complications		Complications		Total
Factor	No.	%	No.	%	No.
Age group
<20	143	99.3	1	0.7	144
20–29	261	97.8	6	2.2	267
30–39	137	95.1	7	4.9	144
40–49	133	97.1	4	2.9	137
50–59	151	96.8	5	3.2	156
60–69	151	94.4	9	5.6	160
70–79	201	96.2	8	3.8	209
>79	176	95.1	9	4.9	185
Sex
Male	732	96.8	24	3.2	756
Female	621	96.1	25	3.9	646
Procedure
Shoulder	482	97.0	15	3.0	497
Ankle	304	97.1	9	2.9	313
Hip	190	92.2	16	7.8	206
Other	377	97.7	9	2.3	386
Maximum sedation score
1–3	861	98.4	14	1.6	875
4 (deep)	345	93.2	25	6.8	370
5 (unresponsive)	25	80.6	6	19.4	31
Not known	122	96.8	4	3.2	126
Time of procedure
08:00–19:59	847	97.4	23	2.6	870
20:00–07:59	488	94.9	26	5.1	514
Not known	18	100.0	0	0.0	18
Pre-procedure pulse
60–100	1027	96.4	38	3.6	1065
<60 or >100	265	97.1	8	2.9	273
Not known	61	95.3	3	4.7	64
Pre-procedure RR
12–20	1104	96.7	38	3.3	1142
<12 or >20	151	96.8	5	3.2	156
Not known	98	94.2	6	5.8	104
Pre-procedure SBP
100–180	1177	96.8	39	3.2	1216
<100 or >180	91	95.8	4	4.2	95
Not known	85	93.4	6	6.6	91
Pre-procedure Spo₂
≥96	1138	96.7	39	3.3	1177
<96	130	95.6	6	4.4	136
Not known	85	95.5	4	4.5	89
Most senior doctor
Consultant or equivalent	384	96.2	15	3.8	399
Other grades	969	96.6	34	3.4	1003
Number of agents used (including nitrous oxide)
1 or 2	711	96.9	23	3.1	734
3 or 4	640	96.1	26	3.9	666
Not known	2	100.0	0	0.0	2
Analgesic used
No fentanyl or morphine	86	98.9	1	1.1	87
Fentanyl not morphine	529	95.8	23	4.2	552
Morphine not fentanyl	718	96.8	24	3.2	742
Fentanyl and morphine	18	94.7	1	5.3	19
Not known	2	100.0	0	0.0	2
Sedative used
No propofol or midazolam	81	98.8	1	1.2	82
Propofol not midazolam	293	95.4	14	4.6	307
Midazolam not propofol	950	96.7	32	3.3	982
Propofol and midazolam	27	93.1	2	6.9	29
Not known	2	100.0	0	0.0	2

RR, respiratory rate; SBP, systolic blood pressure; Spo₂, oxygen saturation.