condition mean min max ZT0-3 16.472701 16.472701 16.472701 ZT4-7 11.4346385 11.4346385 11.4346385 ZT8-11 11.807366 11.807366 11.807366 ZT12-15 9.8236915 9.8236915 9.8236915 ZT16-19 10.386987999999999 10.386987999999999 10.386987999999999 ZT20-23 10.4774575 10.4774575 10.4774575