condition mean min max ZT0-3 131.584283 131.584283 131.584283 ZT4-7 122.90599549999999 122.90599549999999 122.90599549999999 ZT8-11 123.3207315 123.3207315 123.3207315 ZT12-15 137.429773 137.429773 137.429773 ZT16-19 190.7037325 190.7037325 190.7037325 ZT20-23 206.667871 206.667871 206.667871