Table 1

Clinical and demographic characteristics by the cohorts of hysterectomy approach

	Unadjusted results					IPTW results
	MIS hysterectomy (n=20 405)		Open hysterectomy (n=14 291)		P value	MIS hysterectomy (n=16 659)		Open hysterectomy (n=16 624)		P value
Characteristics	No	%	No	%	P value	No	%	No	%	P value
NHS year of surgery
2011/2012*	1127	6	1671	12		1305	8	1306	8
2012/2013	2471	12	2829	20		2566	15	2561	15
2013/2014	2971	15	2614	18		2677	16	2676	16
2014/2015	3387	17	2361	17		2772	17	2782	17
2015/2016	3500	17	1948	14		2635	16	2623	16
2016/2017	4060	20	1852	13		2846	17	2848	17
2017/2018*	2889	14	1016	7	<0.001	1858	11	1828	11	0.812
Age, years
<50	1153	6	1082	8		1052	6	1056	6
50–59	4317	21	3098	22		3568	21	3583	22
60–69	7111	35	4672	33		5683	34	5664	34
70–79	5693	28	3779	26		4541	27	4527	27
80–89	2020	10	1540	11		1702	10	1682	10
90>	111	1	120	1	<0.001	113	1	111	1	0.765
Ethnicity
White	16 453	81	11 117	78		13 272	80	13 222	80
Asian	649	3	499	3		539	3	544	3
Black	251	1	365	3		289	2	285	2
Other	3052	15	2310	16	<0.001	2559	15	2573	15	0.785
Socioeconomic group (IMD)
High	5149	25	3291	23		4194	25	4201	25
Intermediate	5015	25	3387	24		4142	25	4124	25
Low	4924	24	3489	24		4134	25	4109	25
Very low	4768	23	3703	26	<0.001	4188	25	4190	25	0.962
Charlson comorbidity group
0	23	0	13	0		16	0	17	0
1	13 591	67	8405	59		10 577	63	10 550	63
2	5429	27	4535	32		4767	29	4769	29
≥3	1362	7	1338	9	<0.001	1299	8	1288	8	0.966
Region
GLondon	2848	14	2184	15		2419	15	2421	15
Yorks	1771	9	1220	9		1488	9	1512	9
WestMid	1901	9	1672	12		1734	10	1739	10
SouthWest	2751	13	1348	9		1981	12	1936	12
SouthEast	2085	10	1451	10		1675	10	1645	10
NorthWest	2909	14	2550	18		2624	16	2624	16
NorthEast	1402	7	432	3		855	5	860	5
Hcounties	1126	6	912	6		968	6	970	6
EastMid	1650	8	1003	7		1289	8	1292	8
East	1926	9	1497	10		1627	10	1625	10
Missing	36	0	22	0	<0.001	–	–	–	–	0.957
Provider volume
High	12 725	62	8703	61		10 445	63	10 456	63
Intermedate	7140	35	5102	36		5937	36	5894	35
Low	288	1	191	1		232	1	231	1
Very low	36	0	58	0		46	0	43	0
Missing	216	1	237	2	<0.001	–	–	–	–	0.712

*NHS year 2011/2012 and 2017/2018 not full year.
IMD, Index of Multiple Deprivation; IPTW, inverse probability weighting of treatment; MIS, minimally invasive surgery; NHS, National Health Service.