Table 4.

Sensitivity, specificity, positive predictive value, and negative predictive value (95% CI) of BMI z-score (BMIz) decrease for predicting a decrease in Percent Body Fat (%FAT)

Month	N	K	Sensitivity	Specificity	Positive predictive value	Negative predictive value
0–36	118	113	70% (61–78%)	42% (31–54%)	67% (58–75%)	45% (33–57%)
0–12	81	77	68% (56–77%)	31% (19–46%)	64% (53–74%)	46% (30–64%)
12–24	27	23	83% (63–93%)	60% (39–78%)	70% (52–84%)	75% (51–90%)
24–36	10	13	62% (36–82%)	60% (23–88%)	80% (49–94%)	38% (14–69%)

N: Number of subjects with a decrease in BMI z-score (BMIz)

K: Number of subjects with a decrease in Percent Body Fat (%FAT)