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Table 4 Summary of RI determinations of electrolytes (mmol/l) in newborns and infants

From: Establishing reference intervals for electrolytes in newborns and infants using direct ISE analyzer

   N Outlier (Tukey) Min. value Max. value Mean (95% CI) DAP test Lower limit (90% CI) Upper limit (90% CI) RI Harris and Boyd
Na + Newborns 60 No 126 143 133.2 P = 0.157 124.3 141.4 124-141 Combined RIs are suggested
       (132.1-134.2)   (123.1-125.9) (139.4-142.8)   
  Infants 57 No 127 143 136 P = 0.129 129 144.2 129-144  
       (135–137)   (127.1-130.5) (142.6-145.5)   
  Combined 117 No 126 143 134.5 P = 0.327 126 143 126-143  
       (134–135)   (126–127) (142–143)   
K + Newborns 60 No 4.7 8.0 6.20 P = 0.108 3.99 8.26 4.0-8.3 Combined RIs are suggested
       (5.94-6.46)   (3.63-4.33) (7.72-8.63)   
  Infants 57 No 4.0 7.0 5.32 P = 0.090 3.66 6.72 3.7-6.7  
       (5.12-5.52)   (3.37-3.98) (6.39-7.07)   
  Combined 117 No 4.0 8.0 5.69 P = 0.118 4.01 7.9 4.0-7.9  
       (5.52-5.87)   (3.95-4.1) (7.52-8.04)   
Cl - Newborns 60 No 100 115 105.9 P = 0.748 99.6 112.2 100-112 Combined RIs are suggested
       (105.1-106.7)   (98.4-100.8) (111–113.3)   
  Infants 57 No 100 110 104.9 P = 0.536 99.4 110.2 99-110  
       (104.2-105.6)   (98.5-100.3) (109.2-111.2)   
  Combined 117 No 100 111 105.3 P = 0.39 99.7 111 100-111  
       (104.8-105.8)   (99.4-100) (110.2-111.3)