Table 2.

Pressure Thresholds for Sub-Cortical Activations and Cortical Arousals in the Smoke-Exposed Infants, for Each Sleep State and Position at 2 to 4 Weeks, 2 to 3 Months and 5-6 Months Postnatal Age in the Supine and Prone Positions During AS and QS.

Sleep State - Position	Age
	2-4 w		2- 3 mo		5-6 mo
	SCA	CA	SCA	CA	SCA	CA
AS-Supine	193 ± 22	130 ± 43	113 ± 18	138 ± 27	150 ± 61	[233 ± 136]
AS-Prone	252 ± 35	200 ± 26	187 ± 41	188 ± 28	208 ± 120	[133 ± 44]
QS-Supine	235 ± 31	300 ± 153	401 ± 68	512 ± 138	347 ± 107	[713 ± 130]
QS-Prone	310 ± 46	[443 ± 70]	448 ± 73	481 ± 52	597 ± 76	767 ± 88

Values in brackets indicate numbers that were excluded from statistical analysis due to low numbers of cortical arousals observed (n < 3). Pressure thresholds are in cmh₂o. SCA, sub-cortical activations; CA, cortical arousals; AS, active sleep; QS, quiet sleep.