<qa>  What was the first time infants were diagnosed with PCA?The intervention began when infants were 32 to 36 weeks post-conceptual age PCA and ended when infants are 52 to 56 weeks PCA. The efficacy of the intervention and the moderating roles of adult attachment and parental commitment to the intervention were evaluated in terms of infant physical, mental, motor, and social development, and parental adjustment and sensitivity to the infant during the first 2 years. 