condition mean min max ZT0-3 13.769933333333332 12.0914 14.9819 ZT4-7 14.96335 14.96335 14.96335 ZT8-11 12.781 12.781 12.781 ZT12-15 18.553800000000003 17.9447 19.1629 ZT16-19 15.9343 15.9343 15.9343 ZT20-23 17.4854 17.4854 17.4854