condition mean min max ZT0-3 25.17315 25.17315 25.17315 ZT4-7 17.75095 17.75095 17.75095 ZT8-11 25.437649999999998 25.437649999999998 25.437649999999998 ZT12-15 40.6045 40.6045 40.6045 ZT16-19 33.62025 33.62025 33.62025 ZT20-23 31.58115 31.58115 31.58115