condition mean min max ZT0-3 358.606591 358.606591 358.606591 ZT4-7 144.409938 144.409938 144.409938 ZT8-11 150.6371385 150.6371385 150.6371385 ZT12-15 148.3711715 148.3711715 148.3711715 ZT16-19 279.0420625 279.0420625 279.0420625 ZT20-23 287.1856665 287.1856665 287.1856665