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Table 1 Arithmetic median, 2.5th–97.5th percentile, mean and 95% CI of the mean CD4 T cells, CD8 T cells, CD4/CD8 ratio and haemoglobin level

From: Immunohaematological reference values in human immunodeficiency virus-negative adolescent and adults in rural northern Tanzania

Sex n Median 2.5th–97.5th percentile Mean ± SD 95% CI of the Mean P value
Absolute CD4 T cells
Males 42 596.5 291.2–1278.9 665.6 ± 246.8 588.7–742.5 t = 2.7, df = 89,
p = 0.008
Females 60 764.5 288.5–1406.8 802.0 ± 250.2 737.4–866.7  
Total 102 722.5 312.2–1367.6 745.9 ± 256.6 695.5–796.3  
Absolute CD8 T cells
Males 42 417 145.9–977.3 438.2 ± 208.4 373.4–503.0 t = 2.7, df = 90,
p = 0.009
Females 60 513 171.7–1101.7 551.0 ± 215.4 495.4–606.7  
Total 102 472 168.2–996.8 504.6 ± 218.6 461.7–547.5  
CD4/CD8 T cells ratio
Males 42 1.6 1.0–3.7 1.6 ± 0.5 1.5–1.9 t = 1.2, df = 61,
p = 0.2
Females 60 1.5 1.1–2.4 1.5 ± 0.3 1.4–1.6  
Total 102 1.5 1.1–2.5 1.6 ± 0.4 1.5–1.6  
Haemoglobin level
Males 42 14.8 7.0–18.0 14.1 ± 2.7 13.3–14.9 t = 3.1, df = 68,
p = 0.003
Females 60 13.0 7.5–15.4 12.6 ± 1.9 12.0–13.1  
Total 102 13.5 7.1–17.4 13.6 ± 2.4 12.7–13.7  
  1. Reference value are reported in percentile