condition mean min max ZT0-3 11.4717 11.4717 11.4717 ZT4-7 8.769480000000001 8.769480000000001 8.769480000000001 ZT8-11 10.343025 10.343025 10.343025 ZT12-15 15.04025 15.04025 15.04025 ZT16-19 14.955749999999998 14.955749999999998 14.955749999999998 ZT20-23 13.265 13.265 13.265