condition mean min max ZT0-3 4.65983218575 2.6677542115 6.65191016 ZT4-7 2.12927600575 1.7094654325 2.549086579 ZT8-11 3.0534963055 2.759505235 3.347487376 ZT12-15 4.9874938745 3.572106088 6.4028816609999994 ZT16-19 4.597668755 3.4859136415 5.7094238685 ZT20-23 13.02601596725 10.2647827145 15.78724922