condition mean min max ZT0-3 303.374845 303.374845 303.374845 ZT4-7 288.5945355 288.5945355 288.5945355 ZT8-11 268.6134905 268.6134905 268.6134905 ZT12-15 280.5768265 280.5768265 280.5768265 ZT16-19 250.0352405 250.0352405 250.0352405 ZT20-23 223.496996 223.496996 223.496996