condition mean min max ZT0-3 3581.55 3581.55 3581.55 ZT4-7 4248.6 4248.6 4248.6 ZT8-11 3951.3999999999996 3951.3999999999996 3951.3999999999996 ZT12-15 3948.0499999999997 3948.0499999999997 3948.0499999999997 ZT16-19 3547.6 3547.6 3547.6 ZT20-23 3337.65 3337.65 3337.65