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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)

From: BMI z-score in obese children is a poor predictor of adiposity changes over time

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%)
  1. N: Number of subjects with a decrease in BMI z-score (BMIz)
  2. K: Number of subjects with a decrease in Percent Body Fat (%FAT)