condition mean min max ZT0-3 92.014216 92.014216 92.014216 ZT4-7 68.0260345 68.0260345 68.0260345 ZT8-11 77.556537 77.556537 77.556537 ZT12-15 65.912491 65.912491 65.912491 ZT16-19 97.295582 97.295582 97.295582 ZT20-23 111.413126 111.413126 111.413126