condition mean min max ZT0-3 13.505275 13.3464 13.66415 ZT4-7 14.3046 14.3046 14.3046 ZT8-11 17.26425 17.26425 17.26425 ZT12-15 0 0 0 ZT16-19 16.1419 16.1419 16.1419 ZT20-23 13.67855 13.67855 13.67855