Table 4.

Comparison of the SP-A, SP-B and SP-D serum levels in different genotypes of SP-A, SP-B and SP-D genes between the infants with respiratory distress syndrome (case group) and infants without respiratory distress syndrome (control group).

SNP	Genotypes	Case group (ng/ml)	Control group (ng/ml)
SP-A +186A/G	AA	110.67±2.52	112.64±2.13*
	AG	110.27±2.31	113.05±1.85*
	GG	111.20±2.16	114.70±1.75*
SP-A +655C/T	CC	110.68±2.51	112.67±2.25*
	CT	110.08±2.30	113.14±1.72*
	TT	111.70±1.76	114.60±1.70*
SP-B −18A/C	CC	109.74±3.52	110.74±2.47
	CA	109.69±5.34	111.22±2.16
	AA	109.66±5.67	111.10±2.26
SP-B 1580C/T	CC	109.53±4.45	111.42±1.99*
	CT	108.31±5.28	110.94±2.12*
	TT	114.01±1.94	110.41±3.01*
SP-D Met11ThrT/C	TT	112.27±4.99	111.16±2.00
	TC	111.43±3.60	111.10±2.79
	CC	110.08±2.65	111.73±3.30
SP-D Ala160ThrG/A	GG	110.88±3.30	111.71±2.62
	GA	111.96±3.00	110.54±3.45
	AA	110.75±2.72	112.92±2.23

^*Compared with the control group, P<0.05;

SNP – single nucleotide polymorphism.