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Effects of methylphenidate on height, weight and blood biochemistry parameters in prepubertal boys with attention deficit hyperactivity disorder: an open label prospective study


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FIGURE 1.

Association between the differences of weight z-score and ALP from baseline to 6 months
Association between the differences of weight z-score and ALP from baseline to 6 months

Comparisons of baseline and 6 months values in Wilcoxon signed-rank test

Variables Measurements M, (SD) Negative ranks Positive ranks Statistics
Baseline 6 months N mean rank sum of ranks N mean rank sum of ranks Ties Z Significance (p)* Effect size (r)
Weight z- 0.63 (1.12) 0.24 (1.04) 29 16.83 488 2 4 9 0 ‒4.704 0.000* 0.5
score
P1NP 471.15 (264.24) 648.30 (507.60) 14 13.14 184 17 18.35 312 0 ‒1.254 0.210
NTx 248.48 (228.69) 250.29 (256.86) 21 14.33 301 10 19.50 195 0 ‒1.039 0.299
WBC 8.31 (2.68) 7.65 (1.70) 21 15.29 321 9 16 144 0 ‒1.822 0.069
RBC 4.84 (0.52) 4.78 (0.51) 12 16.29 195.5 13 9.96 129.50 5 ‒0.896 0.370
BUN 11.20 (2.80) 12.06 (2.51) 11 11.18 123 15 15.20 228 4 ‒1.339 0.181
Magnesium 2.07 (0.16) 2.01 (0.18) 11 12.36 136 8 6.75 54 11 ‒1.676 0.094
ALT 16.66 (13.38) 16.46 (8.55) 12 15.83 190 15 12.53 188 3 ‒0.024 0.981
Ferritin 23.34 (11.57 19.72 (8.56) 19 13.18 250.50 8 15.94 127.50 2 ‒1.479 0.139
Transferrin 266.06 (51.58) 270.31 (30.90) 17 13.47 229 11 16.09 177 1 ‒0.592 0.554
Iron 79.10 (31.90) 75.37 (34.01) 16 15.38 246 12 13.33 160 1 ‒0.979 0.327
PTH 38.09 (14.52) 35.41 (24.25) 21 15.88 333.50 8 12.69 101.50 0 ‒2.509 0.012
OSC 67.25 (18.75) 60.18 (19.07) 19 16.39 311.50 10 12.35 123.50 0 ‒2.033 0.042
25OH-vit D 18.42 (7.15) 27.22 (7.18) 4 8.25 33 25 16.08 402 0 ‒3.989 0.000* 0.5

Study participants

Subjects   N
Prepubertal boys with ADHD 98
    Parents who rejected 21
    Excluded at baseline exam   8
        Intellectual disability (N=2)
        Pubertal signs (N=2)
        Very high levels of TSH (N=1) and transaminases (N=1)
        Severe anemia (N=1)
        Very low growth percentile (N=1)
Recruited subjects 69
    Drop-outs due to adverse effects   8
        Appetite loss and insomnia (N=2)
        Nausea and appetite loss (N=1)
        Stomachache and irritability (N=1)
        Syncope (N=1)
        Headache (N=1)
        Insomnia, irritability, and appetite loss (N=1)
        Headache, stomachache, and insomnia (N=1)
    Drop-outs due to other causes 30
        Weak compliance (N=6)
        Parental disagreement (N=6)
        Summer holiday (N=6)
        Surgical operation (N=2)
        City change (N=3)
        Pubertal signs (N=2)
        Unknown (N=5)
Sample size 31

Comparisons of baseline and 6 months values in paired samples t-test

Variable BaselineM (SD) 6 monthsM (SD) T value df Significance(p)* Effect size(r)
Height z-score 0.23 (0.87) 0.28 (0.85) ‒1.50 30 0.142
Hemoglobin 12.57 (0.87) 12.47 (0.86) 0.89 29 0.380
Hematocrit 38.22 (2.52) 37.850 (2.26) 0.91 29 0.368
Platelet 331.53 (91.91) 311.50 (59.96) 1.37 29 0.179
Glucose 82.54 (6.21) 88.09 (6.66) ‒4.33 30 0.000* 0.6
Creatinine 0.56 (0.08) 0.60 (0.06) ‒3.27 30 0.003* 0.5
Calcium 9.46 (0.51) 9.51 (0.45) ‒0.46 29 0.648
Phosphate 4.71 (0.45) 4.66 (0.42) 0.56 28 0.578
AST 29.26 (6.23) 29.60 (3.98) ‒0.33 29 0.738
ALP 243.06 (47.07) 215.24 (44.33) 3.63 28 0.001* 0.5
Vitamin B12 306.72 (121.66) 288.41 (115.31) 1.10 28 0.278
TSH 2.64 (0.98) 2.38 (1.03) 1.68 28 0.104
fT3 3.96 (0.65) 3.73 (0.46) 1.93 28 0.063
fT4 0.87 (0.10) 0.86 (0.09) 0.60 28 0.553
B-ALP 84.44 (25.58) 82.98 (23.25) 0.32 28 0.750
eISSN:
2245-8875
Language:
English
Publication timeframe:
Volume Open
Journal Subjects:
Medicine, Basic Medical Science, other