Section D: Unit based data

Unit Based Mortality Statistics

Table A13 presents mortality rates by Health Board and Region of Resident in 2015.

Table A14 shows stillbirth and mortality rates by the hospital or midwifery led unit where the baby was born. This year we were not able to produce a table showing stillbirth and mortality rates by intended hospital of birth at onset of labour due to lack of accurate data.

Figures 22 to 24 show the mortality rate for each unit plotted against the number of births in that unit.

These rates are unadjusted for variables known to influence mortality rate such as social deprivation, case mix and referral bias. Therefore, we urge readers to exercise caution whilst interpreting the data. Complicated pregnancies are likely to be referred to the regional centre, or a sub-regional centre and these may account for the higher rates observed in such units. This effect is partly ameliorated by analysing the data according to the intended place of delivery at onset of labour, but referral bias is still likely. The University Hospital of Wales in Cardiff is the only centre in Wales offering fetal medicine interventions and neonatal/paediatric surgical services hence can be expected to have higher mortality rates (Table A14).

It is not intended that the results of these reports are considered to be evidence of poor performance in any specific instance but rather that they are taken as suggesting that further exploration of the data is needed at a local level.

Mortality rates by hospital (2011 – 2015)

These funnel plots show the mortality rate for each hospital plotted against the number of births in that hospital. The funnel plots are calculated assuming that the populations of women giving birth are directly comparable between units and therefore they do not allow for any heterogeneity, such as differences in case mix between units. Hence there may be plausible reasons for the significantly higher or lower rates in the units that are identified as outliers as in units 2 and 8 in figures 23 and 24. Again the results are adjusted for the size of the unit in terms of total registrable births; but not in terms of the neonatal facilities offered such as Fetal Medicine, Regional Neonatal Intensive Care and Neonatal Surgery which are available in hospital 8. Further examination of the data in detail is needed to fully understand the situation with regards these outliers.

Figure 22: Stillbirth mortality rate (excluding late terminations) by hospital of death: 2011-2015


Hospitals 1,2,3,4,6,8 and 9 includes data from alongside midwifery units.
Hospital 5 includes data from alongside and freestanding midwifery units.
Hospital 7 includes data from freestanding units Bryn Beryl, Dolgellau and Tywyn midwifery units.
Within Powys there are 6 established birth centres: Brecon; Llandrindod Wells; Knighton; Llanidloes; Newtown; Welshpool.
Please note included in Singleton Hospital’s data is a death which occurred in a non-maternity hospital belonging to the same Health Board.

Figure 23: Perinatal mortality rate (excluding late terminations) by hospital of death: 2011-2015


Hospitals 1, 2,3,4,6, 8 and 9 includes data from alongside midwifery units.
Hospital 5 includes data from alongside and freestanding midwifery units.
Hospital 7 includes data from freestanding units Bryn Beryl, Dolgellau and Tywyn midwifery units.
Within Powys there are 6 established birth centres: Brecon; Llandrindod Wells; Knighton; Llanidloes; Newtown; Welshpool.
Please note included in Singleton Hospital’s data is a death which occurred in a non-maternity hospital belonging to the same Health Board.

Figure 24: Neonatal mortality rate (excluding late terminations) by hospital of death: 2011-2015


Hospitals 1, 2,3,4,6, 8 and 9 includes data from alongside midwifery units.
Hospital 5 includes data from alongside and freestanding midwifery units.
Hospital 7 includes data from freestanding units Bryn Beryl, Dolgellau and Tywyn midwifery units.
Within Powys there are 6 established birth centres: Brecon; Llandrindod Wells; Knighton; Llanidloes; Newtown; Welshpool.