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Table 1 Characteristics of the clinical dataset analysed in the “Application of the methods to routinely collected IVF data” section. Median, interquartile range and range for continuous variables

From: Multivariate prediction of mixed, multilevel, sequential outcomes arising from in vitro fertilisation

Variable Summary
No of cycles started 2962
No of cycles where eggs mixed with sperm 2861
No of gradable embryos 12911
Number of embryo transfer procedures 2501
Age (years) 33
30 to 36
21 to 43
Partner age (years) 35
32 to 39
19 to 72
Attempt number
 1 2132 (72%)
 2 659 (22%)
 3 147 (5%)
 4 4 (0%)
 5 20 (0%)
Number of eggs obtained per cycle started 9
5 to 13
0 to 50
Number of gradable embryos per cycle started 3
1 to 5
0 to 19
Number of embryos transferred per transfer procedure
 1 1049 (42%)
 2 1452 (58%)
Live birth event per transfer procedure
 No 1692 (68%)
 Yes 809 (32%)
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