condition mean min max ZT0-3 37.61475 37.61475 37.61475 ZT4-7 26.4319 26.4319 26.4319 ZT8-11 23.71315 23.71315 23.71315 ZT12-15 35.218 35.218 35.218 ZT16-19 39.4834 39.4834 39.4834 ZT20-23 38.57405 38.57405 38.57405