condition mean min max ZT0-3 11.31615 11.31615 11.31615 ZT4-7 5.924275 5.924275 5.924275 ZT8-11 6.13508 6.13508 6.13508 ZT12-15 7.807305 7.807305 7.807305 ZT16-19 13.8021 13.8021 13.8021 ZT20-23 13.47335 13.47335 13.47335