condition mean min max ZT0-3 87.739281 87.739281 87.739281 ZT4-7 120.357339 120.357339 120.357339 ZT8-11 117.23011349999999 117.23011349999999 117.23011349999999 ZT12-15 116.6347675 116.6347675 116.6347675 ZT16-19 108.0216275 108.0216275 108.0216275 ZT20-23 102.48545 102.48545 102.48545