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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%)