condition mean min max ZT0-3 149.669382 149.669382 149.669382 ZT4-7 261.964018 261.964018 261.964018 ZT8-11 256.7122795 256.7122795 256.7122795 ZT12-15 193.6581055 193.6581055 193.6581055 ZT16-19 177.384724 177.384724 177.384724 ZT20-23 177.487717 177.487717 177.487717