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Table 2 Descriptive statistics at all times of assessment

From: Genetic and maternal predictors of cognitive and behavioral trajectories in females with fragile X syndrome

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Variables

Mean (SD) [range]

Mean (SD) [range]

Mean (SD) [range]

Mean (SD) [range]

Chronological age

12 (1.5) [10–16]

13 (1.5) [11–17]

14 (1.5) [12–18]

15 (1.5) [13–19]

Biological predictors

 Ratio of affected to total chromosomes

56.47 (19.92) [27–88]

   

 Level of FMRP expression

0.48 (0.05) [0.34–0.51]

   

Maternal predictors

 Maternal psychological distress

51.5 (11.6) [30–65]

   

 Closeness in the mother–child relationship

23.5 (4.1) [16–28]

   

Dependent variables

 Fluid intelligence (SS)

68 (13.6) [48–90]

70.3 (15.5) [48–100]

62.9 (12.6) [48–88]

66.5 (15.2) [48–102]

 Fluid intelligence (RS)

33.9 (12.8) [17–55]

38.9 (11.6) [18–58]

37.4 (13.3) [17–61]

39.8 (13.1) [20–61]

 Crystallized intelligence (SS)

81.2 (17.6) [51–107]

84 (16.3) [57–112]

81.3 (15.7) [52–100]

82.7 (20.9) [41–109]

 Crystallized intelligence (RS)

87.8 (19.8) [53–120]

95.9 (20.3) [64–132]

96.6 (20.2) [62–135]

103.8 (25) [62–148]

 Anxious behaviors (TS)

59.53 (10.01) [50–84]

60 (7.7) [50–72]

60.1 (8.2) [50–74]

58.2 (7.2) [50–70]

 Withdrawn behaviors (TS)

62.5 (11.6) [50–87]

59.8 (9.4) [50–81]

64.4 (10.7) [50–81]

62 (11.8) [50–85]

  1. Abbreviations: SS standardized score (mean of 100, standard deviation of 15), RS raw score, TS T-score (mean of 50, standard deviation of 10)