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. 2002 Apr 12;2:6. doi: 10.1186/1471-5945-2-6

Table 4.

Serotonin and melatonin serum levels^* of the UVA-exposed volunteers and non-exposed controls

Serum level	T1	T2	T3
Serotonin (ng/ml)
UVA-exposed (n = 42)	215 ± 75.2	228.7 ± 84.2 ^a	213.2 ± 69.1 ^d
Non-exposed (n = 11)	(191.9 ± 53.7)	(198.9 ± 52.4)	(212.5 ± 78.5)

Melatonin (ρg/ml)
UVA-exposed (n = 42)	17.3 ± 15.1	12.5 ± 8^b	17.9 ± 20.2 ^e
Non-exposed (n = 11)	(25.7 ± 19.7)	(20.6 ± 15.3) ^c	(28.6 ± 41.1)

^* Data comprise mean ± SD; ^a P < 0.001 vs T1; ^b P = 0.01 vs T1; ^c P = 0.005 vs T1; ^d P = 0.02 vs T2; ^e P 0.03 vs T2