condition mean min max ZT0-3 22.880221925 21.21153306 24.54891079 ZT4-7 9.72867583075 6.719997465 12.7373541965 ZT8-11 8.065626587499999 6.6714261409999995 9.459827034 ZT12-15 14.961033318999998 9.486743501 20.435323136999997 ZT16-19 17.720051355000003 14.683841495 20.756261215000002 ZT20-23 13.961731976 11.562558972 16.36090498