condition mean min max ZT0-3 3.6364675 3.128585 4.14435 ZT4-7 0.752283 0.752283 0.752283 ZT8-11 0.457711 0.457711 0.457711 ZT12-15 0 0 0 ZT16-19 1.1103839999999998 1.1103839999999998 1.1103839999999998 ZT20-23 0.969633 0.969633 0.969633