condition mean min max ZT0-3 33.020133 33.020133 33.020133 ZT4-7 48.080471 48.080471 48.080471 ZT8-11 59.284357 59.284357 59.284357 ZT12-15 51.65407999999999 51.65407999999999 51.65407999999999 ZT16-19 46.4916605 46.4916605 46.4916605 ZT20-23 33.697348 33.697348 33.697348