condition mean min max ZT0-3 206.066351 206.066351 206.066351 ZT4-7 25.3694065 25.3694065 25.3694065 ZT8-11 19.713822999999998 19.713822999999998 19.713822999999998 ZT12-15 17.8554015 17.8554015 17.8554015 ZT16-19 254.2933305 254.2933305 254.2933305 ZT20-23 279.6127725 279.6127725 279.6127725