condition mean min max ZT0-3 14.792038 14.792038 14.792038 ZT4-7 17.103289 17.103289 17.103289 ZT8-11 13.071093 13.071093 13.071093 ZT12-15 10.798922999999998 10.798922999999998 10.798922999999998 ZT16-19 15.816562000000001 15.816562000000001 15.816562000000001 ZT20-23 19.056784 19.056784 19.056784