condition mean min max ZT0-3 14.5321726025 7.611308925 21.45303628 ZT4-7 16.9643240825 15.99818128 17.930466885 ZT8-11 14.819632862499999 13.431959084999999 16.20730664 ZT12-15 20.9369182 17.88256441 23.99127199 ZT16-19 24.465537207500002 22.352875400000002 26.578199015000003 ZT20-23 26.14674012 24.725305640000002 27.5681746