Table 2.
Statistics on the within-cluster populations of the 10 most common nutritional patterns and the whole cohort.
| Property type | Whole cohort | Cluster rank | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |||
| Cluster size | N | 45,679 | 11,052 | 5,471 | 4,868 | 3,951 | 2,935 | 2,913 | 2,707 | 1,382 | 1,207 | 758 |
| Proportion | 24% | 12% | 11% | 9% | 6% | 6% | 6% | 3% | 3% | 2% | ||
| Cumulative proportion | 24% | 36% | 47% | 56% | 62% | 68% | 74% | 77% | 80% | 82% | ||
| Geographical location variables | North | 30% | 32% | 27% | 29% | 36% | 29% | 27% | 40% | 14% | 17% | 26% |
| Midlands | 27% | 28% | 30% | 33% | 36% | 18% | 27% | 27% | 10% | 15% | 37% | |
| London | 20% | 19% | 18% | 17% | 11% | 22% | 24% | 16% | 45% | 36% | 27% | |
| South | 23% | 22% | 25% | 20% | 18% | 30% | 23% | 17% | 32% | 32% | 11% | |
| Admission variables | Birth Year | 2015 | 2015 | 2015 | 2015 | 2015 | 2015 | 2014 | 2015 | 2015 | 2015 | 2015 |
| Gestational Age (weeks) | 29 | 30 | 29 | 29 | 28 | 29 | 31 | 25 | 30 | 28 | 28 | |
| BW z-score | − 0.23 | − 0.09 | − 0.22 | − 0.31 | − 0.41 | − 0.36 | 0.27 | − 0.35 | − 0.24 | − 0.37 | − 0.20 | |
| Resuscitation | 8% | 6% | 8% | 7% | 9% | 9% | 2% | 17% | 5% | 9% | 12% | |
| Antenatal Steroids | 90% | 89% | 93% | 93% | 91% | 89% | 91% | 85% | 93% | 94% | 88% | |
| Sex (% girls) | 46% | 45% | 46% | 49% | 47% | 47% | 43% | 40% | 47% | 45% | 40% | |
| Apgar 1 min | 6 | 7 | 6 | 6 | 6 | 6 | 8 | 4 | 7 | 6 | 6 | |
| Apgar 5 min | 8 | 9 | 8 | 9 | 8 | 8 | 9 | 7 | 9 | 8 | 8 | |
| Apgar 10 min | 9 | 9 | 9 | 9 | 9 | 9 | 10 | 8 | 9 | 9 | 9 | |
| Outcome variables | Mortality | 8% | 1% | 1% | 1% | 2% | 1% | 0% | 76% | 0% | 0% | 27% |
| Necrotising Enterocolitis (NEC) | 3% | 2% | 0% | 0% | 3% | 2% | 0% | 11% | 0% | 0% | 34% | |
| Bronchopulmonary Dysplasia (BPD) | 27% | 20% | 26% | 30% | 46% | 36% | 2% | 11% | 15% | 36% | 40% | |
| Maternal Milk at Discharge | 54% | 34% | 99% | 90% | 27% | 8% | 93% | 32% | 89% | 98% | 30% | |
| Length of Stay (days) | 49 | 42 | 52 | 54 | 70 | 60 | 30 | 9 | 43 | 65 | 60 | |
| W36 z− score | − 1.59 | − 1.33 | − 1.66 | − 1.68 | − 1.74 | − 1.53 | − 1.29 | − 1.59 | − 1.69 | − 1.64 | − 1.78 | |
| W36dz | − 1.20 | − 1.07 | − 1.31 | − 1.22 | − 1.23 | − 1.07 | − 1.39 | − 1.33 | − 1.22 | − 1.18 | − 1.40 | |
| Nutritional variables | Maternal Milk | 0.66 | 0.51 | 0.96 | 0.95 | 0.68 | 0.30 | 0.93 | 0.32 | 0.92 | 0.96 | 0.43 |
| Human Donor Milk | 0.06 | 0.00 | 0.00 | 0.00 | 0.00 | 0.24 | 0.00 | 0.00 | 0.22 | 0.06 | 0.00 | |
| Breast Milk Fortifier | 0.14 | 0.00 | 0.30 | 0.35 | 0.22 | 0.00 | 0.00 | 0.00 | 0.00 | 0.44 | 0.00 | |
| Formula Milk | 0.38 | 0.67 | 0.00 | 0.27 | 0.45 | 0.69 | 0.40 | 0.00 | 0.44 | 0.01 | 0.44 | |
| Parenteral Nutrition | 0.21 | 0.17 | 0.18 | 0.13 | 0.20 | 0.19 | 0.00 | 0.74 | 0.14 | 0.14 | 0.59 | |
| Glucose Electrolyte | 0.17 | 0.12 | 0.10 | 0.10 | 0.12 | 0.11 | 0.17 | 0.57 | 0.11 | 0.08 | 0.49 | |
Clusters are ranked according to population size (1 = largest cluster). All variables are reported as median values, except for proportions which are means. Proportions are reported as integer values, therefore 0% corresponds to < 0.5% and the sum across the geographical location variables may not be exactly 100%. Nutritional variables encode the nutritional patterns through the proportion of days a nutritional component was given over the total time in care (between 0 and 1).