condition mean min max ZT0-3 2880.3978 2880.3978 2880.3978 ZT4-7 2178.278921 2178.278921 2178.278921 ZT8-11 2590.6585315 2590.6585315 2590.6585315 ZT12-15 2528.3967755000003 2528.3967755000003 2528.3967755000003 ZT16-19 3091.7670120000002 3091.7670120000002 3091.7670120000002 ZT20-23 3400.2308279999997 3400.2308279999997 3400.2308279999997