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Table 5 Summary statistics of the gestational week (GW) related to a subset (Cluster 1: n=6; Cluster 2: n=8; Cluster 3: n=9) of hard clustered subjects (i.e. with membership score greater or equal than 0.7)

From: A hierarchical procedure to select intrauterine and extrauterine factors for methodological validation of preterm birth risk estimation

Cluster

Min GW

1st Qu. GW

Median GW

Mean GW

Sd GW

3rd Qu. GW

Max GW

1

38.00

40.00

40.00

39.93

1.03

40.45

41.00

2

32.20

37.75

38.65

37.68

2.31

38.92

39.00

3

29.00

35.00

36.40

36.31

3.79

38.60

40.70

  1. We obtained the three clusters by fuzzy C-means on the risk factors selected by AIC