Table 7.

Comparison of serological examinations before discharge between the two groups of premature infants.

Group (n)	Total protein (g/L)	Albumin (g/L)	Calcium (mmol/L)	Phosphorus (mmol/L)	ALP (IU/L)
Observation (185)	46.60 (43.40, 50.35)	33.50 (31.80, 36.00)	2.37 (2.26, 2.46)	2.10 (1.84, 2.34)	254.00 (203.50, 334.50)
Control (185)	46.40 (43.95, 50.00)	34.20 (32.00, 36.00)	2.35 (2.22, 2.45)	2.22 (1.92, 2.58)	220.00 (178.00, 278.00)
Z	−0.479	−1.285	−1.758	−1.758	−3.748
P	0.632	0.199	0.079	0.006	0.000