condition mean min max ZT0-3 11.790965 11.790965 11.790965 ZT4-7 9.492387 9.492387 9.492387 ZT8-11 9.533446000000001 9.533446000000001 9.533446000000001 ZT12-15 13.4329465 13.4329465 13.4329465 ZT16-19 11.6992115 11.6992115 11.6992115 ZT20-23 11.373268 11.373268 11.373268